CHANGELOG.md

Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog.

This project adheres to Semantic Versioning.

Unreleased

Changed

• Metric SDK export.ExportKind, export.ExportKindSelector types have been renamed to aggregation.Temporality and aggregation.TemporalitySelector respectively to keep in line with current specification and protocol along with built-in selectors (e.g., aggregation.CumulativeTemporalitySelector, ...). (#2274)
• The Metric Exporter interface now requires a TemporalitySelector method instead of an ExportKindSelector. (#2274)
• Metrics API cleanup. The metric/sdkapi package has been created to relocate the API-to-SDK interface:
  • The following interface types simply moved from metric to metric/sdkapi: Descriptor, MeterImpl, InstrumentImpl, SyncImpl, BoundSyncImpl, AsyncImpl, AsyncRunner, AsyncSingleRunner, and AsyncBatchRunner
  • The following struct types moved and are replaced with type aliases, since they are exposed to the user: Observation, Measurement.
  • The No-op implementations of sync and async instruments are no longer exported, new functions sdkapi.NewNoopAsyncInstrument() and sdkapi.NewNoopSyncInstrument() are provided instead. (#2271)

Added

• Add the "go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc".WithGRPCConn option so the exporter can reuse an existing gRPC connection. (#2002)
• Added a new schema module to help parse Schema Files in OTEP 0152 format. (#2267)
• Added a new MapCarrier to the go.opentelemetry.io/otel/propagation package to hold propagated coss-cutting concerns as a map[string]string held in memory. (#2334)

1.1.0 - 2021-10-27

Added

• Add the "go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc".WithGRPCConn option so the exporter can reuse an existing gRPC connection. (#2002)
• Add the go.opentelemetry.io/otel/semconv/v1.7.0 package. The package contains semantic conventions from the v1.7.0 version of the OpenTelemetry specification. (#2320)
• Add the go.opentelemetry.io/otel/semconv/v1.6.1 package. The package contains semantic conventions from the v1.6.1 version of the OpenTelemetry specification. (#2321)
• Add the go.opentelemetry.io/otel/semconv/v1.5.0 package. The package contains semantic conventions from the v1.5.0 version of the OpenTelemetry specification. (#2322)
  • When upgrading from the semconv/v1.4.0 package note the following name changes:
    • K8SReplicasetUIDKey -> K8SReplicaSetUIDKey
    • K8SReplicasetNameKey -> K8SReplicaSetNameKey
    • K8SStatefulsetUIDKey -> K8SStatefulSetUIDKey
    • k8SStatefulsetNameKey -> K8SStatefulSetNameKey
    • K8SDaemonsetUIDKey -> K8SDaemonSetUIDKey
    • K8SDaemonsetNameKey -> K8SDaemonSetNameKey

Changed

• Links added to a span will be dropped by the SDK if they contain an invalid span context (#2275).

Fixed

• The "go.opentelemetry.io/otel/semconv/v1.4.0".HTTPServerAttributesFromHTTPRequest now correctly only sets the HTTP client IP attribute even if the connection was routed with proxies and there are multiple addresses in the X-Forwarded-For header. (#2282, #2284)
• The "go.opentelemetry.io/otel/semconv/v1.4.0".NetAttributesFromHTTPRequest function correctly handles IPv6 addresses as IP addresses and sets the correct net peer IP instead of the net peer hostname attribute. (#2283, #2285)
• The simple span processor shutdown method deterministically returns the exporter error status if it simultaneously finishes when the deadline is reached. (#2290, #2289)

1.0.1 - 2021-10-01

Fixed

• json stdout exporter no longer crashes due to concurrency bug. (#2265)

Metrics 0.24.0 - 2021-10-01

Changed

• NoopMeterProvider is now private and NewNoopMeterProvider must be used to obtain a noopMeterProvider. (#2237)
• The Metric SDK Export() function takes a new two-level reader interface for iterating over results one instrumentation library at a time. (#2197)
  • The former "go.opentelemetry.io/otel/sdk/export/metric".CheckpointSet is renamed Reader.
  • The new interface is named "go.opentelemetry.io/otel/sdk/export/metric".InstrumentationLibraryReader.

1.0.0 - 2021-09-20

This is the first stable release for the project. This release includes an API and SDK for the tracing signal that will comply with the stability guarantees defined by the projects versioning policy.

Added

• OTLP trace exporter now sets the SchemaURL field in the exported telemetry if the Tracer has WithSchemaURL option. (#2242)

Fixed

• Slice-valued attributes can correctly be used as map keys. (#2223)

Removed

• Removed the "go.opentelemetry.io/otel/exporters/zipkin".WithSDKOptions function. (#2248)
• Removed the deprecated package go.opentelemetry.io/otel/oteltest. (#2234)
• Removed the deprecated package go.opentelemetry.io/otel/bridge/opencensus/utils. (#2233)
• Removed deprecated functions, types, and methods from go.opentelemetry.io/otel/attribute package. Use the typed functions and methods added to the package instead. (#2235)
  • The Key.Array method is removed.
  • The Array function is removed.
  • The Any function is removed.
  • The ArrayValue function is removed.
  • The AsArray function is removed.

1.0.0-RC3 - 2021-09-02

Added

• Added ErrorHandlerFunc to use a function as an "go.opentelemetry.io/otel".ErrorHandler. (#2149)
• Added "go.opentelemetry.io/otel/trace".WithStackTrace option to add a stack trace when using span.RecordError or when panic is handled in span.End. (#2163)
• Added typed slice attribute types and functionality to the go.opentelemetry.io/otel/attribute package to replace the existing array type and functions. (#2162)
  • BoolSlice, IntSlice, Int64Slice, Float64Slice, and StringSlice replace the use of the Array function in the package.
• Added the go.opentelemetry.io/otel/example/fib example package. Included is an example application that computes Fibonacci numbers. (#2203)

Changed

• Metric instruments have been renamed to match the (feature-frozen) metric API specification:
  • ValueRecorder becomes Histogram
  • ValueObserver becomes Gauge
  • SumObserver becomes CounterObserver
  • UpDownSumObserver becomes UpDownCounterObserver The API exported from this project is still considered experimental. (#2202)
• Metric SDK/API implementation type InstrumentKind moves into sdkapi sub-package. (#2091)
• The Metrics SDK export record no longer contains a Resource pointer, the SDK "go.opentelemetry.io/otel/sdk/trace/export/metric".Exporter.Export() function for push-based exporters now takes a single Resource argument, pull-based exporters use "go.opentelemetry.io/otel/sdk/metric/controller/basic".Controller.Resource(). (#2120)
• The JSON output of the go.opentelemetry.io/otel/exporters/stdout/stdouttrace is harmonized now such that the output is "plain" JSON objects after each other of the form { ... } { ... } { ... }. Earlier the JSON objects describing a span were wrapped in a slice for each Exporter.ExportSpans call, like [ { ... } ][ { ... } { ... } ]. Outputting JSON object directly after each other is consistent with JSON loggers, and a bit easier to parse and read. (#2196)
• Update the NewTracerConfig, NewSpanStartConfig, NewSpanEndConfig, and NewEventConfig function in the go.opentelemetry.io/otel/trace package to return their respective configurations as structs instead of pointers to the struct. (#2212)

Deprecated

• The go.opentelemetry.io/otel/bridge/opencensus/utils package is deprecated. All functionality from this package now exists in the go.opentelemetry.io/otel/bridge/opencensus package. The functions from that package should be used instead. (#2166)
• The "go.opentelemetry.io/otel/attribute".Array function and the related ARRAY value type is deprecated. Use the typed *Slice functions and types added to the package instead. (#2162)
• The "go.opentelemetry.io/otel/attribute".Any function is deprecated. Use the typed functions instead. (#2181)
• The go.opentelemetry.io/otel/oteltest package is deprecated. The "go.opentelemetry.io/otel/sdk/trace/tracetest".SpanRecorder can be registered with the default SDK (go.opentelemetry.io/otel/sdk/trace) as a SpanProcessor and used as a replacement for this deprecated package. (#2188)

Removed

• Removed metrics test package go.opentelemetry.io/otel/sdk/export/metric/metrictest. (#2105)

Fixed

• The fromEnv detector no longer throws an error when OTEL_RESOURCE_ATTRIBUTES environment variable is not set or empty. (#2138)
• Setting the global ErrorHandler with "go.opentelemetry.io/otel".SetErrorHandler multiple times is now supported. (#2160, #2140)
• The "go.opentelemetry.io/otel/attribute".Any function now supports int32 values. (#2169)
• Multiple calls to "go.opentelemetry.io/otel/sdk/metric/controller/basic".WithResource() are handled correctly, and when no resources are provided "go.opentelemetry.io/otel/sdk/resource".Default() is used. (#2120)
• The WithoutTimestamps option for the go.opentelemetry.io/otel/exporters/stdout/stdouttrace exporter causes the exporter to correctly ommit timestamps. (#2195)
• Fixed typos in resources.go. (#2201)

1.0.0-RC2 - 2021-07-26

Added

• Added WithOSDescription resource configuration option to set OS (Operating System) description resource attribute (os.description). (#1840)
• Added WithOS resource configuration option to set all OS (Operating System) resource attributes at once. (#1840)
• Added the WithRetry option to the go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp package. This option is a replacement for the removed WithMaxAttempts and WithBackoff options. (#2095)
• Added API LinkFromContext to return Link which encapsulates SpanContext from provided context and also encapsulates attributes. (#2115)
• Added a new Link type under the SDK otel/sdk/trace package that counts the number of attributes that were dropped for surpassing the AttributePerLinkCountLimit configured in the Span's SpanLimits. This new type replaces the equal-named API Link type found in the otel/trace package for most usages within the SDK. For example, instances of this type are now returned by the Links() function of ReadOnlySpans provided in places like the OnEnd function of SpanProcessor implementations. (#2118)
• Added the SpanRecorder type to the go.opentelemetry.io/otel/skd/trace/tracetest package. This type can be used with the default SDK as a SpanProcessor during testing. (#2132)

Changed

• The SpanModels function is now exported from the go.opentelemetry.io/otel/exporters/zipkin package to convert OpenTelemetry spans into Zipkin model spans. (#2027)
• Rename the "go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc".RetrySettings to RetryConfig. (#2095)

Deprecated

• The TextMapCarrier and TextMapPropagator from the go.opentelemetry.io/otel/oteltest package and their associated creation functions (TextMapCarrier, NewTextMapPropagator) are deprecated. (#2114)
• The Harness type from the go.opentelemetry.io/otel/oteltest package and its associated creation function, NewHarness are deprecated and will be removed in the next release. (#2123)
• The TraceStateFromKeyValues function from the go.opentelemetry.io/otel/oteltest package is deprecated. Use the trace.ParseTraceState function instead. (#2122)

Removed

• Removed the deprecated package go.opentelemetry.io/otel/exporters/trace/jaeger. (#2020)
• Removed the deprecated package go.opentelemetry.io/otel/exporters/trace/zipkin. (#2020)
• Removed the "go.opentelemetry.io/otel/sdk/resource".WithBuiltinDetectors function. The explicit With* options for every built-in detector should be used instead. (#2026 #2097)
• Removed the WithMaxAttempts and WithBackoff options from the go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp package. The retry logic of the package has been updated to match the otlptracegrpc package and accordingly a WithRetry option is added that should be used instead. (#2095)
• Removed DroppedAttributeCount field from otel/trace.Link struct. (#2118)

Fixed

• When using WithNewRoot, don't use the parent context for making sampling decisions. (#2032)
• oteltest.Tracer now creates a valid SpanContext when using WithNewRoot. (#2073)
• OS type detector now sets the correct dragonflybsd value for DragonFly BSD. (#2092)
• The OTel span status is correctly transformed into the OTLP status in the go.opentelemetry.io/otel/exporters/otlp/otlptrace package. This fix will by default set the status to Unset if it is not explicitly set to Ok or Error. (#2099 #2102)
• The Inject method for the "go.opentelemetry.io/otel/propagation".TraceContext type no longer injects empty tracestate values. (#2108)
• Use 6831 as default Jaeger agent port instead of 6832. (#2131)

Experimental Metrics v0.22.0 - 2021-07-19

Added

• Adds HTTP support for OTLP metrics exporter. (#2022)

Removed

• Removed the deprecated package go.opentelemetry.io/otel/exporters/metric/prometheus. (#2020)

1.0.0-RC1 / 0.21.0 - 2021-06-18

With this release we are introducing a split in module versions. The tracing API and SDK are entering the v1.0.0 Release Candidate phase with v1.0.0-RC1 while the experimental metrics API and SDK continue with v0.x releases at v0.21.0. Modules at major version 1 or greater will not depend on modules with major version 0.

Added

• Adds otlpgrpc.WithRetryoption for configuring the retry policy for transient errors on the otlp/gRPC exporter. (#1832)
  • The following status codes are defined as transient errors:

    gRPC Status Code	Description
    1	Cancelled
    4	Deadline Exceeded
    8	Resource Exhausted
    10	Aborted
    10	Out of Range
    14	Unavailable
    15	Data Loss

• Added Status type to the go.opentelemetry.io/otel/sdk/trace package to represent the status of a span. (#1874)
• Added SpanStub type and its associated functions to the go.opentelemetry.io/otel/sdk/trace/tracetest package. This type can be used as a testing replacement for the SpanSnapshot that was removed from the go.opentelemetry.io/otel/sdk/trace package. (#1873)
• Adds support for scheme in OTEL_EXPORTER_OTLP_ENDPOINT according to the spec. (#1886)
• Adds trace.WithSchemaURL option for configuring the tracer with a Schema URL. (#1889)
• Added an example of using OpenTelemetry Go as a trace context forwarder. (#1912)
• ParseTraceState is added to the go.opentelemetry.io/otel/trace package. It can be used to decode a TraceState from a tracestate header string value. (#1937)
• Added Len method to the TraceState type in the go.opentelemetry.io/otel/trace package. This method returns the number of list-members the TraceState holds. (#1937)
• Creates package go.opentelemetry.io/otel/exporters/otlp/otlptrace that defines a trace exporter that uses a otlptrace.Client to send data. Creates package go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc implementing a gRPC otlptrace.Client and offers convenience functions, NewExportPipeline and InstallNewPipeline, to setup and install a otlptrace.Exporter in tracing .(#1922)
• Added Baggage, Member, and Property types to the go.opentelemetry.io/otel/baggage package along with their related functions. (#1967)
• Added ContextWithBaggage, ContextWithoutBaggage, and FromContext functions to the go.opentelemetry.io/otel/baggage package. These functions replace the Set, Value, ContextWithValue, ContextWithoutValue, and ContextWithEmpty functions from that package and directly work with the new Baggage type. (#1967)
• The OTEL_SERVICE_NAME environment variable is the preferred source for service.name, used by the environment resource detector if a service name is present both there and in OTEL_RESOURCE_ATTRIBUTES. (#1969)
• Creates package go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp implementing an HTTP otlptrace.Client and offers convenience functions, NewExportPipeline and InstallNewPipeline, to setup and install a otlptrace.Exporter in tracing. (#1963)
• Changes go.opentelemetry.io/otel/sdk/resource.NewWithAttributes to require a schema URL. The old function is still available as resource.NewSchemaless. This is a breaking change. (#1938)
• Several builtin resource detectors now correctly populate the schema URL. (#1938)
• Creates package go.opentelemetry.io/otel/exporters/otlp/otlpmetric that defines a metrics exporter that uses a otlpmetric.Client to send data.
• Creates package go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc implementing a gRPC otlpmetric.Client and offers convenience functions, New and NewUnstarted, to create an otlpmetric.Exporter.(#1991)
• Added go.opentelemetry.io/otel/exporters/stdout/stdouttrace exporter. (#2005)
• Added go.opentelemetry.io/otel/exporters/stdout/stdoutmetric exporter. (#2005)
• Added a TracerProvider() method to the "go.opentelemetry.io/otel/trace".Span interface. This can be used to obtain a TracerProvider from a given span that utilizes the same trace processing pipeline. (#2009)

Changed

• Make NewSplitDriver from go.opentelemetry.io/otel/exporters/otlp take variadic arguments instead of a SplitConfig item. NewSplitDriver now automatically implements an internal noopDriver for SplitConfig fields that are not initialized. (#1798)
• resource.New() now creates a Resource without builtin detectors. Previous behavior is now achieved by using WithBuiltinDetectors Option. (#1810)
• Move the Event type from the go.opentelemetry.io/otel package to the go.opentelemetry.io/otel/sdk/trace package. (#1846)
• CI builds validate against last two versions of Go, dropping 1.14 and adding 1.16. (#1865)
• BatchSpanProcessor now report export failures when calling ForceFlush() method. (#1860)
• Set.Encoded(Encoder) no longer caches the result of an encoding. (#1855)
• Renamed CloudZoneKey to CloudAvailabilityZoneKey in Resource semantic conventions according to spec. (#1871)
• The StatusCode and StatusMessage methods of the ReadOnlySpan interface and the Span produced by the go.opentelemetry.io/otel/sdk/trace package have been replaced with a single Status method. This method returns the status of a span using the new Status type. (#1874)
• Updated ExportSpans method of theSpanExporter interface type to accept ReadOnlySpans instead of the removed SpanSnapshot. This brings the export interface into compliance with the specification in that it now accepts an explicitly immutable type instead of just an implied one. (#1873)
• Unembed SpanContext in Link. (#1877)
• Generate Semantic conventions from the specification YAML. (#1891)
• Spans created by the global Tracer obtained from go.opentelemetry.io/otel, prior to a functioning TracerProvider being set, now propagate the span context from their parent if one exists. (#1901)
• The "go.opentelemetry.io/otel".Tracer function now accepts tracer options. (#1902)
• Move the go.opentelemetry.io/otel/unit package to go.opentelemetry.io/otel/metric/unit. (#1903)
• Changed go.opentelemetry.io/otel/trace.TracerConfig to conform to the Contributing guidelines (#1921)
• Changed go.opentelemetry.io/otel/trace.SpanConfig to conform to the Contributing guidelines. (#1921)
• Changed span.End() now only accepts Options that are allowed at End(). (#1921)
• Changed go.opentelemetry.io/otel/metric.InstrumentConfig to conform to the Contributing guidelines. (#1921)
• Changed go.opentelemetry.io/otel/metric.MeterConfig to conform to the Contributing guidelines. (#1921)
• Refactored option types according to the contribution style guide. (#1882)
• Move the go.opentelemetry.io/otel/trace.TraceStateFromKeyValues function to the go.opentelemetry.io/otel/oteltest package. This function is preserved for testing purposes where it may be useful to create a TraceState from attribute.KeyValues, but it is not intended for production use. The new ParseTraceState function should be used to create a TraceState. (#1931)
• Updated MarshalJSON method of the go.opentelemetry.io/otel/trace.TraceState type to marshal the type into the string representation of the TraceState. (#1931)
• The TraceState.Delete method from the go.opentelemetry.io/otel/trace package no longer returns an error in addition to a TraceState. (#1931)
• Updated Get method of the TraceState type from the go.opentelemetry.io/otel/trace package to accept a string instead of an attribute.Key type. (#1931)
• Updated Insert method of the TraceState type from the go.opentelemetry.io/otel/trace package to accept a pair of strings instead of an attribute.KeyValue type. (#1931)
• Updated Delete method of the TraceState type from the go.opentelemetry.io/otel/trace package to accept a string instead of an attribute.Key type. (#1931)
• Renamed NewExporter to New in the go.opentelemetry.io/otel/exporters/stdout package. (#1985)
• Renamed NewExporter to New in the go.opentelemetry.io/otel/exporters/metric/prometheus package. (#1985)
• Renamed NewExporter to New in the go.opentelemetry.io/otel/exporters/trace/jaeger package. (#1985)
• Renamed NewExporter to New in the go.opentelemetry.io/otel/exporters/trace/zipkin package. (#1985)
• Renamed NewExporter to New in the go.opentelemetry.io/otel/exporters/otlp package. (#1985)
• Renamed NewUnstartedExporter to NewUnstarted in the go.opentelemetry.io/otel/exporters/otlp package. (#1985)
• The go.opentelemetry.io/otel/semconv package has been moved to go.opentelemetry.io/otel/semconv/v1.4.0 to allow for multiple telemetry schema versions to be used concurrently. (#1987)
• Metrics test helpers in go.opentelemetry.io/otel/oteltest have been moved to go.opentelemetry.io/otel/metric/metrictest. (#1988)

Deprecated

• The go.opentelemetry.io/otel/exporters/metric/prometheus is deprecated, use go.opentelemetry.io/otel/exporters/prometheus instead. (#1993)
• The go.opentelemetry.io/otel/exporters/trace/jaeger is deprecated, use go.opentelemetry.io/otel/exporters/jaeger instead. (#1993)
• The go.opentelemetry.io/otel/exporters/trace/zipkin is deprecated, use go.opentelemetry.io/otel/exporters/zipkin instead. (#1993)

Removed

• Removed resource.WithoutBuiltin(). Use resource.New(). (#1810)
• Unexported types resource.FromEnv, resource.Host, and resource.TelemetrySDK, Use the corresponding With*() to use individually. (#1810)
• Removed the Tracer and IsRecording method from the ReadOnlySpan in the go.opentelemetry.io/otel/sdk/trace. The Tracer method is not a required to be included in this interface and given the mutable nature of the tracer that is associated with a span, this method is not appropriate. The IsRecording method returns if the span is recording or not. A read-only span value does not need to know if updates to it will be recorded or not. By definition, it cannot be updated so there is no point in communicating if an update is recorded. (#1873)
• Removed the SpanSnapshot type from the go.opentelemetry.io/otel/sdk/trace package. The use of this type has been replaced with the use of the explicitly immutable ReadOnlySpan type. When a concrete representation of a read-only span is needed for testing, the newly added SpanStub in the go.opentelemetry.io/otel/sdk/trace/tracetest package should be used. (#1873)
• Removed the Tracer method from the Span interface in the go.opentelemetry.io/otel/trace package. Using the same tracer that created a span introduces the error where an instrumentation library's Tracer is used by other code instead of their own. The "go.opentelemetry.io/otel".Tracer function or a TracerProvider should be used to acquire a library specific Tracer instead. (#1900)
  • The TracerProvider() method on the Span interface may also be used to obtain a TracerProvider using the same trace processing pipeline. (#2009)
• The http.url attribute generated by HTTPClientAttributesFromHTTPRequest will no longer include username or password information. (#1919)
• Removed IsEmpty method of the TraceState type in the go.opentelemetry.io/otel/trace package in favor of using the added TraceState.Len method. (#1931)
• Removed Set, Value, ContextWithValue, ContextWithoutValue, and ContextWithEmpty functions in the go.opentelemetry.io/otel/baggage package. Handling of baggage is now done using the added Baggage type and related context functions (ContextWithBaggage, ContextWithoutBaggage, and FromContext) in that package. (#1967)
• The InstallNewPipeline and NewExportPipeline creation functions in all the exporters (prometheus, otlp, stdout, jaeger, and zipkin) have been removed. These functions were deemed premature attempts to provide convenience that did not achieve this aim. (#1985)
• The go.opentelemetry.io/otel/exporters/otlp exporter has been removed. Use go.opentelemetry.io/otel/exporters/otlp/otlptrace instead. (#1990)
• The go.opentelemetry.io/otel/exporters/stdout exporter has been removed. Use go.opentelemetry.io/otel/exporters/stdout/stdouttrace or go.opentelemetry.io/otel/exporters/stdout/stdoutmetric instead. (#2005)

Fixed

• Only report errors from the "go.opentelemetry.io/otel/sdk/resource".Environment function when they are not nil. (#1850, #1851)
• The Shutdown method of the simple SpanProcessor in the go.opentelemetry.io/otel/sdk/trace package now honors the context deadline or cancellation. (#1616, #1856)
• BatchSpanProcessor now drops span batches that failed to be exported. (#1860)
• Use http://localhost:14268/api/traces as default Jaeger collector endpoint instead of http://localhost:14250. (#1898)
• Allow trailing and leading whitespace in the parsing of a tracestate header. (#1931)
• Add logic to determine if the channel is closed to fix Jaeger exporter test panic with close closed channel. (#1870, #1973)
• Avoid transport security when OTLP endpoint is a Unix socket. (#2001)

Security

0.20.0 - 2021-04-23

Added

• The OTLP exporter now has two new convenience functions, NewExportPipeline and InstallNewPipeline, setup and install the exporter in tracing and metrics pipelines. (#1373)
• Adds semantic conventions for exceptions. (#1492)
• Added Jaeger Environment variables: OTEL_EXPORTER_JAEGER_AGENT_HOST, OTEL_EXPORTER_JAEGER_AGENT_PORT These environment variables can be used to override Jaeger agent hostname and port (#1752)
• Option ExportTimeout was added to batch span processor. (#1755)
• trace.TraceFlags is now a defined type over byte and WithSampled(bool) TraceFlags and IsSampled() bool methods have been added to it. (#1770)
• The Event and Link struct types from the go.opentelemetry.io/otel package now include a DroppedAttributeCount field to record the number of attributes that were not recorded due to configured limits being reached. (#1771)
• The Jaeger exporter now reports dropped attributes for a Span event in the exported log. (#1771)
• Adds test to check BatchSpanProcessor ignores OnEnd and ForceFlush post Shutdown. (#1772)
• Extract resource attributes from the OTEL_RESOURCE_ATTRIBUTES environment variable and merge them with the resource.Default resource as well as resources provided to the TracerProvider and metric Controller. (#1785)
• Added WithOSType resource configuration option to set OS (Operating System) type resource attribute (os.type). (#1788)
• Added WithProcess* resource configuration options to set Process resource attributes. (#1788)
  • process.pid
  • process.executable.name
  • process.executable.path
  • process.command_args
  • process.owner
  • process.runtime.name
  • process.runtime.version
  • process.runtime.description
• Adds k8s.node.name and k8s.node.uid attribute keys to the semconv package. (#1789)
• Added support for configuring OTLP/HTTP and OTLP/gRPC Endpoints, TLS Certificates, Headers, Compression and Timeout via Environment Variables. (#1758, #1769 and #1811)
  • OTEL_EXPORTER_OTLP_ENDPOINT
  • OTEL_EXPORTER_OTLP_TRACES_ENDPOINT
  • OTEL_EXPORTER_OTLP_METRICS_ENDPOINT
  • OTEL_EXPORTER_OTLP_HEADERS
  • OTEL_EXPORTER_OTLP_TRACES_HEADERS
  • OTEL_EXPORTER_OTLP_METRICS_HEADERS
  • OTEL_EXPORTER_OTLP_COMPRESSION
  • OTEL_EXPORTER_OTLP_TRACES_COMPRESSION
  • OTEL_EXPORTER_OTLP_METRICS_COMPRESSION
  • OTEL_EXPORTER_OTLP_TIMEOUT
  • OTEL_EXPORTER_OTLP_TRACES_TIMEOUT
  • OTEL_EXPORTER_OTLP_METRICS_TIMEOUT
  • OTEL_EXPORTER_OTLP_CERTIFICATE
  • OTEL_EXPORTER_OTLP_TRACES_CERTIFICATE
  • OTEL_EXPORTER_OTLP_METRICS_CERTIFICATE
• Adds otlpgrpc.WithTimeout option for configuring timeout to the otlp/gRPC exporter. (#1821)
• Adds jaeger.WithMaxPacketSize option for configuring maximum UDP packet size used when connecting to the Jaeger agent. (#1853)

Fixed

• The Span.IsRecording implementation from go.opentelemetry.io/otel/sdk/trace always returns false when not being sampled. (#1750)
• The Jaeger exporter now correctly sets tags for the Span status code and message. This means it uses the correct tag keys ("otel.status_code", "otel.status_description") and does not set the status message as a tag unless it is set on the span. (#1761)
• The Jaeger exporter now correctly records Span event's names using the "event" key for a tag. Additionally, this tag is overridden, as specified in the OTel specification, if the event contains an attribute with that key. (#1768)
• Zipkin Exporter: Ensure mapping between OTel and Zipkin span data complies with the specification. (#1688)
• Fixed typo for default service name in Jaeger Exporter. (#1797)
• Fix flaky OTLP for the reconnnection of the client connection. (#1527, #1814)
• Fix Jaeger exporter dropping of span batches that exceed the UDP packet size limit. Instead, the exporter now splits the batch into smaller sendable batches. (#1828)

Changed

• Span RecordError now records an exception event to comply with the semantic convention specification. (#1492)
• Jaeger exporter was updated to use thrift v0.14.1. (#1712)
• Migrate from using internally built and maintained version of the OTLP to the one hosted at go.opentelemetry.io/proto/otlp. (#1713)
• Migrate from using github.com/gogo/protobuf to google.golang.org/protobuf to match go.opentelemetry.io/proto/otlp. (#1713)
• The storage of a local or remote Span in a context.Context using its SpanContext is unified to store just the current Span. The Span's SpanContext can now self-identify as being remote or not. This means that "go.opentelemetry.io/otel/trace".ContextWithRemoteSpanContext will now overwrite any existing current Span, not just existing remote Spans, and make it the current Span in a context.Context. (#1731)
• Improve OTLP/gRPC exporter connection errors. (#1737)
• Information about a parent span context in a "go.opentelemetry.io/otel/export/trace".SpanSnapshot is unified in a new Parent field. The existing ParentSpanID and HasRemoteParent fields are removed in favor of this. (#1748)
• The ParentContext field of the "go.opentelemetry.io/otel/sdk/trace".SamplingParameters is updated to hold a context.Context containing the parent span. This changes it to make SamplingParameters conform with the OpenTelemetry specification. (#1749)
• Updated Jaeger Environment Variables: JAEGER_ENDPOINT, JAEGER_USER, JAEGER_PASSWORD to OTEL_EXPORTER_JAEGER_ENDPOINT, OTEL_EXPORTER_JAEGER_USER, OTEL_EXPORTER_JAEGER_PASSWORD in compliance with OTel specification. (#1752)
• Modify BatchSpanProcessor.ForceFlush to abort after timeout/cancellation. (#1757)
• The DroppedAttributeCount field of the Span in the go.opentelemetry.io/otel package now only represents the number of attributes dropped for the span itself. It no longer is a conglomerate of itself, events, and link attributes that have been dropped. (#1771)
• Make ExportSpans in Jaeger Exporter honor context deadline. (#1773)
• Modify Zipkin Exporter default service name, use default resource's serviceName instead of empty. (#1777)
• The go.opentelemetry.io/otel/sdk/export/trace package is merged into the go.opentelemetry.io/otel/sdk/trace package. (#1778)
• The prometheus.InstallNewPipeline example is moved from comment to example test (#1796)
• The convenience functions for the stdout exporter have been updated to return the TracerProvider implementation and enable the shutdown of the exporter. (#1800)
• Replace the flush function returned from the Jaeger exporter's convenience creation functions (InstallNewPipeline and NewExportPipeline) with the TracerProvider implementation they create. This enables the caller to shutdown and flush using the related TracerProvider methods. (#1822)
• Updated the Jaeger exporter to have a default endpoint, http://localhost:14250, for the collector. (#1824)
• Changed the function WithCollectorEndpoint in the Jaeger exporter to no longer accept an endpoint as an argument. The endpoint can be passed with the CollectorEndpointOption using the WithEndpoint function or by setting the OTEL_EXPORTER_JAEGER_ENDPOINT environment variable value appropriately. (#1824)
• The Jaeger exporter no longer batches exported spans itself, instead it relies on the SDK's BatchSpanProcessor for this functionality. (#1830)
• The Jaeger exporter creation functions (NewRawExporter, NewExportPipeline, and InstallNewPipeline) no longer accept the removed Option type as a variadic argument. (#1830)

Removed

• Removed Jaeger Environment variables: JAEGER_SERVICE_NAME, JAEGER_DISABLED, JAEGER_TAGS These environment variables will no longer be used to override values of the Jaeger exporter (#1752)
• No longer set the links for a Span in go.opentelemetry.io/otel/sdk/trace that is configured to be a new root. This is unspecified behavior that the OpenTelemetry community plans to standardize in the future. To prevent backwards incompatible changes when it is specified, these links are removed. (#1726)
• Setting error status while recording error with Span from oteltest package. (#1729)
• The concept of a remote and local Span stored in a context is unified to just the current Span. Because of this "go.opentelemetry.io/otel/trace".RemoteSpanContextFromContext is removed as it is no longer needed. Instead, "go.opentelemetry.io/otel/trace".SpanContextFromContex can be used to return the current Span. If needed, that Span's SpanContext.IsRemote() can then be used to determine if it is remote or not. (#1731)
• The HasRemoteParent field of the "go.opentelemetry.io/otel/sdk/trace".SamplingParameters is removed. This field is redundant to the information returned from the Remote method of the SpanContext held in the ParentContext field. (#1749)
• The trace.FlagsDebug and trace.FlagsDeferred constants have been removed and will be localized to the B3 propagator. (#1770)
• Remove Process configuration, WithProcessFromEnv and ProcessFromEnv, and type from the Jaeger exporter package. The information that could be configured in the Process struct should be configured in a Resource instead. (#1776, #1804)
• Remove the WithDisabled option from the Jaeger exporter. To disable the exporter unregister it from the TracerProvider or use a no-operation TracerProvider. (#1806)
• Removed the functions CollectorEndpointFromEnv and WithCollectorEndpointOptionFromEnv from the Jaeger exporter. These functions for retrieving specific environment variable values are redundant of other internal functions and are not intended for end user use. (#1824)
• Removed the Jaeger exporter WithSDKOptions Option. This option was used to set SDK options for the exporter creation convenience functions. These functions are provided as a way to easily setup or install the exporter with what are deemed reasonable SDK settings for common use cases. If the SDK needs to be configured differently, the NewRawExporter function and direct setup of the SDK with the desired settings should be used. (#1825)
• The WithBufferMaxCount and WithBatchMaxCount Options from the Jaeger exporter are removed. The exporter no longer batches exports, instead relying on the SDK's BatchSpanProcessor for this functionality. (#1830)
• The Jaeger exporter Option type is removed. The type is no longer used by the exporter to configure anything. All the previous configurations these options provided were duplicates of SDK configuration. They have been removed in favor of using the SDK configuration and focuses the exporter configuration to be only about the endpoints it will send telemetry to. (#1830)

0.19.0 - 2021-03-18

Added

• Added Marshaler config option to otlphttp to enable otlp over json or protobufs. (#1586)
• A ForceFlush method to the "go.opentelemetry.io/otel/sdk/trace".TracerProvider to flush all registered SpanProcessors. (#1608)
• Added WithSampler and WithSpanLimits to tracer provider. (#1633, #1702)
• "go.opentelemetry.io/otel/trace".SpanContext now has a remote property, and IsRemote() predicate, that is true when the SpanContext has been extracted from remote context data. (#1701)
• A Valid method to the "go.opentelemetry.io/otel/attribute".KeyValue type. (#1703)

Changed

• trace.SpanContext is now immutable and has no exported fields. (#1573)
  • trace.NewSpanContext() can be used in conjunction with the trace.SpanContextConfig struct to initialize a new SpanContext where all values are known.
• Update the ForceFlush method signature to the "go.opentelemetry.io/otel/sdk/trace".SpanProcessor to accept a context.Context and return an error. (#1608)
• Update the Shutdown method to the "go.opentelemetry.io/otel/sdk/trace".TracerProvider return an error on shutdown failure. (#1608)
• The SimpleSpanProcessor will now shut down the enclosed SpanExporter and gracefully ignore subsequent calls to OnEnd after Shutdown is called. (#1612)
• "go.opentelemetry.io/sdk/metric/controller.basic".WithPusher is replaced with WithExporter to provide consistent naming across project. (#1656)
• Added non-empty string check for trace Attribute keys. (#1659)
• Add description to SpanStatus only when StatusCode is set to error. (#1662)
• Jaeger exporter falls back to resource.Default's service.name if the exported Span does not have one. (#1673)
• Jaeger exporter populates Jaeger's Span Process from Resource. (#1673)
• Renamed the LabelSet method of "go.opentelemetry.io/otel/sdk/resource".Resource to Set. (#1692)
• Changed WithSDK to WithSDKOptions to accept variadic arguments of TracerProviderOption type in go.opentelemetry.io/otel/exporters/trace/jaeger package. (#1693)
• Changed WithSDK to WithSDKOptions to accept variadic arguments of TracerProviderOption type in go.opentelemetry.io/otel/exporters/trace/zipkin package. (#1693)

Removed

• Removed serviceName parameter from Zipkin exporter and uses resource instead. (#1549)
• Removed WithConfig from tracer provider to avoid overriding configuration. (#1633)
• Removed the exported SimpleSpanProcessor and BatchSpanProcessor structs. These are now returned as a SpanProcessor interface from their respective constructors. (#1638)
• Removed WithRecord() from trace.SpanOption when creating a span. (#1660)
• Removed setting status to Error while recording an error as a span event in RecordError. (#1663)
• Removed jaeger.WithProcess configuration option. (#1673)
• Removed ApplyConfig method from "go.opentelemetry.io/otel/sdk/trace".TracerProvider and the now unneeded Config struct. (#1693)

Fixed

• Jaeger Exporter: Ensure mapping between OTEL and Jaeger span data complies with the specification. (#1626)
• SamplingResult.TraceState is correctly propagated to a newly created span's SpanContext. (#1655)
• The otel-collector example now correctly flushes metric events prior to shutting down the exporter. (#1678)
• Do not set span status message in SpanStatusFromHTTPStatusCode if it can be inferred from http.status_code. (#1681)
• Synchronization issues in global trace delegate implementation. (#1686)
• Reduced excess memory usage by global TracerProvider. (#1687)

0.18.0 - 2021-03-03

Added

• Added resource.Default() for use with meter and tracer providers. (#1507)
• AttributePerEventCountLimit and AttributePerLinkCountLimit for SpanLimits. (#1535)
• Added Keys() method to propagation.TextMapCarrier and propagation.HeaderCarrier to adapt http.Header to this interface. (#1544)
• Added code attributes to go.opentelemetry.io/otel/semconv package. (#1558)
• Compatibility testing suite in the CI system for the following systems. (#1567)

  OS	Go Version	Architecture
  Ubuntu	1.15	amd64
  Ubuntu	1.14	amd64
  Ubuntu	1.15	386
  Ubuntu	1.14	386
  MacOS	1.15	amd64
  MacOS	1.14	amd64
  Windows	1.15	amd64
  Windows	1.14	amd64
  Windows	1.15	386
  Windows	1.14	386

Changed

• Replaced interface oteltest.SpanRecorder with its existing implementation StandardSpanRecorder. (#1542)

• Default span limit values to 128. (#1535)

• Rename MaxEventsPerSpan, MaxAttributesPerSpan and MaxLinksPerSpan to EventCountLimit, AttributeCountLimit and LinkCountLimit, and move these fields into SpanLimits. (#1535)

• Renamed the otel/label package to otel/attribute. (#1541)

• Vendor the Jaeger exporter's dependency on Apache Thrift. (#1551)

• Parallelize the CI linting and testing. (#1567)

• Stagger timestamps in exact aggregator tests. (#1569)

• Changed all examples to use WithBatchTimeout(5 * time.Second) rather than WithBatchTimeout(5). (#1621)

• Prevent end-users from implementing some interfaces (#1575)

      "otel/exporters/otlp/otlphttp".Option
      "otel/exporters/stdout".Option
      "otel/oteltest".Option
      "otel/trace".TracerOption
      "otel/trace".SpanOption
      "otel/trace".EventOption
      "otel/trace".LifeCycleOption
      "otel/trace".InstrumentationOption
      "otel/sdk/resource".Option
      "otel/sdk/trace".ParentBasedSamplerOption
      "otel/sdk/trace".ReadOnlySpan
      "otel/sdk/trace".ReadWriteSpan
  

Removed

• Removed attempt to resample spans upon changing the span name with span.SetName(). (#1545)
• The test-benchmark is no longer a dependency of the precommit make target. (#1567)
• Removed the test-386 make target. This was replaced with a full compatibility testing suite (i.e. multi OS/arch) in the CI system. (#1567)

Fixed

• The sequential timing check of timestamps in the stdout exporter are now setup explicitly to be sequential (#1571). (#1572)
• Windows build of Jaeger tests now compiles with OS specific functions (#1576). (#1577)
• The sequential timing check of timestamps of go.opentelemetry.io/otel/sdk/metric/aggregator/lastvalue are now setup explicitly to be sequential (#1578). (#1579)
• Validate tracestate header keys with vendors according to the W3C TraceContext specification (#1475). (#1581)
• The OTLP exporter includes related labels for translations of a GaugeArray (#1563). (#1570)

0.17.0 - 2021-02-12

Changed

• Rename project default branch from master to main. (#1505)
• Reverse order in which Resource attributes are merged, per change in spec. (#1501)
• Add tooling to maintain "replace" directives in go.mod files automatically. (#1528)
• Create new modules: otel/metric, otel/trace, otel/oteltest, otel/sdk/export/metric, otel/sdk/metric (#1528)
• Move metric-related public global APIs from otel to otel/metric/global. (#1528)

Fixed

• Fixed otlpgrpc reconnection issue.
• The example code in the README.md of go.opentelemetry.io/otel/exporters/otlp is moved to a compiled example test and used the new WithAddress instead of WithEndpoint. (#1513)
• The otel-collector example now uses the default OTLP receiver port of the collector.

0.16.0 - 2021-01-13

Added

• Add the ReadOnlySpan and ReadWriteSpan interfaces to provide better control for accessing span data. (#1360)
• NewGRPCDriver function returns a ProtocolDriver that maintains a single gRPC connection to the collector. (#1369)
• Added documentation about the project's versioning policy. (#1388)
• Added NewSplitDriver for OTLP exporter that allows sending traces and metrics to different endpoints. (#1418)
• Added codeql worfklow to GitHub Actions (#1428)
• Added Gosec workflow to GitHub Actions (#1429)
• Add new HTTP driver for OTLP exporter in exporters/otlp/otlphttp. Currently it only supports the binary protobuf payloads. (#1420)
• Add an OpenCensus exporter bridge. (#1444)

Changed

• Rename internal/testing to internal/internaltest. (#1449)
• Rename export.SpanData to export.SpanSnapshot and use it only for exporting spans. (#1360)
• Store the parent's full SpanContext rather than just its span ID in the span struct. (#1360)
• Improve span duration accuracy. (#1360)
• Migrated CI/CD from CircleCI to GitHub Actions (#1382)
• Remove duplicate checkout from GitHub Actions workflow (#1407)
• Metric array aggregator renamed exact to match its aggregation.Kind (#1412)
• Metric exact aggregator includes per-point timestamps (#1412)
• Metric stdout exporter uses MinMaxSumCount aggregator for ValueRecorder instruments (#1412)
• NewExporter from exporters/otlp now takes a ProtocolDriver as a parameter. (#1369)
• Many OTLP Exporter options became gRPC ProtocolDriver options. (#1369)
• Unify endpoint API that related to OTel exporter. (#1401)
• Optimize metric histogram aggregator to re-use its slice of buckets. (#1435)
• Metric aggregator Count() and histogram Bucket.Counts are consistently uint64. (1430)
• Histogram aggregator accepts functional options, uses default boundaries if none given. (#1434)
• SamplingResult now passed a Tracestate from the parent SpanContext (#1432)
• Moved gRPC driver for OTLP exporter to exporters/otlp/otlpgrpc. (#1420)
• The TraceContext propagator now correctly propagates TraceState through the SpanContext. (#1447)
• Metric Push and Pull Controller components are combined into a single "basic" Controller:
  • WithExporter() and Start() to configure Push behavior
  • Start() is optional; use Collect() and ForEach() for Pull behavior
  • Start() and Stop() accept Context. (#1378)
• The Event type is moved from the otel/sdk/export/trace package to the otel/trace API package. (#1452)

Removed

• Remove errUninitializedSpan as its only usage is now obsolete. (#1360)
• Remove Metric export functionality related to quantiles and summary data points: this is not specified (#1412)
• Remove DDSketch metric aggregator; our intention is to re-introduce this as an option of the histogram aggregator after new OTLP histogram data types are released (#1412)

Fixed

• BatchSpanProcessor.Shutdown() will now shutdown underlying export.SpanExporter. (#1443)

0.15.0 - 2020-12-10

Added

• The WithIDGenerator TracerProviderOption is added to the go.opentelemetry.io/otel/trace package to configure an IDGenerator for the TracerProvider. (#1363)

Changed

• The Zipkin exporter now uses the Span status code to determine. (#1328)
• NewExporter and Start functions in go.opentelemetry.io/otel/exporters/otlp now receive context.Context as a first parameter. (#1357)
• Move the OpenCensus example into example directory. (#1359)
• Moved the SDK's internal.IDGenerator interface in to the sdk/trace package to enable support for externally-defined ID generators. (#1363)
• Bump github.com/google/go-cmp from 0.5.3 to 0.5.4 (#1374)
• Bump github.com/golangci/golangci-lint in /internal/tools (#1375)

Fixed

• Metric SDK SumObserver and UpDownSumObserver instruments correctness fixes. (#1381)

0.14.0 - 2020-11-19

Added

• An EventOption and the related NewEventConfig function are added to the go.opentelemetry.io/otel package to configure Span events. (#1254)
• A TextMapPropagator and associated TextMapCarrier are added to the go.opentelemetry.io/otel/oteltest package to test TextMap type propagators and their use. (#1259)
• SpanContextFromContext returns SpanContext from context. (#1255)
• TraceState has been added to SpanContext. (#1340)
• DeploymentEnvironmentKey added to go.opentelemetry.io/otel/semconv package. (#1323)
• Add an OpenCensus to OpenTelemetry tracing bridge. (#1305)
• Add a parent context argument to SpanProcessor.OnStart to follow the specification. (#1333)
• Add missing tests for sdk/trace/attributes_map.go. (#1337)

Changed

• Move the go.opentelemetry.io/otel/api/trace package into go.opentelemetry.io/otel/trace with the following changes. (#1229) (#1307)
  • ID has been renamed to TraceID.
  • IDFromHex has been renamed to TraceIDFromHex.
  • EmptySpanContext is removed.
• Move the go.opentelemetry.io/otel/api/trace/tracetest package into go.opentelemetry.io/otel/oteltest. (#1229)
• OTLP Exporter updates:
  • supports OTLP v0.6.0 (#1230, #1354)
  • supports configurable aggregation temporality (default: Cumulative, optional: Stateless). (#1296)
• The Sampler is now called on local child spans. (#1233)
• The Kind type from the go.opentelemetry.io/otel/api/metric package was renamed to InstrumentKind to more specifically describe what it is and avoid semantic ambiguity. (#1240)
• The MetricKind method of the Descriptor type in the go.opentelemetry.io/otel/api/metric package was renamed to Descriptor.InstrumentKind. This matches the returned type and fixes misuse of the term metric. (#1240)
• Move test harness from the go.opentelemetry.io/otel/api/apitest package into go.opentelemetry.io/otel/oteltest. (#1241)
• Move the go.opentelemetry.io/otel/api/metric/metrictest package into go.opentelemetry.io/oteltest as part of #964. (#1252)
• Move the go.opentelemetry.io/otel/api/metric package into go.opentelemetry.io/otel/metric as part of #1303. (#1321)
• Move the go.opentelemetry.io/otel/api/metric/registry package into go.opentelemetry.io/otel/metric/registry as a part of #1303. (#1316)
• Move the Number type (together with related functions) from go.opentelemetry.io/otel/api/metric package into go.opentelemetry.io/otel/metric/number as a part of #1303. (#1316)
• The function signature of the Span AddEvent method in go.opentelemetry.io/otel is updated to no longer take an unused context and instead take a required name and a variable number of EventOptions. (#1254)
• The function signature of the Span RecordError method in go.opentelemetry.io/otel is updated to no longer take an unused context and instead take a required error value and a variable number of EventOptions. (#1254)
• Move the go.opentelemetry.io/otel/api/global package to go.opentelemetry.io/otel. (#1262) (#1330)
• Move the Version function from go.opentelemetry.io/otel/sdk to go.opentelemetry.io/otel. (#1330)
• Rename correlation context header from "otcorrelations" to "baggage" to match the OpenTelemetry specification. (#1267)
• Fix Code.UnmarshalJSON to work with valid JSON only. (#1276)
• The resource.New() method changes signature to support builtin attributes and functional options, including telemetry.sdk.* and host.name semantic conventions; the former method is renamed resource.NewWithAttributes. (#1235)
• The Prometheus exporter now exports non-monotonic counters (i.e. UpDownCounters) as gauges. (#1210)
• Correct the Span.End method documentation in the otel API to state updates are not allowed on a span after it has ended. (#1310)
• Updated span collection limits for attribute, event and link counts to 1000 (#1318)
• Renamed semconv.HTTPUrlKey to semconv.HTTPURLKey. (#1338)

Removed

• The ErrInvalidHexID, ErrInvalidTraceIDLength, ErrInvalidSpanIDLength, ErrInvalidSpanIDLength, or ErrNilSpanID from the go.opentelemetry.io/otel package are unexported now. (#1243)
• The AddEventWithTimestamp method on the Span interface in go.opentelemetry.io/otel is removed due to its redundancy. It is replaced by using the AddEvent method with a WithTimestamp option. (#1254)
• The MockSpan and MockTracer types are removed from go.opentelemetry.io/otel/oteltest. Tracer and Span from the same module should be used in their place instead. (#1306)
• WorkerCount option is removed from go.opentelemetry.io/otel/exporters/otlp. (#1350)
• Remove the following labels types: INT32, UINT32, UINT64 and FLOAT32. (#1314)

Fixed

• Rename MergeItererator to MergeIterator in the go.opentelemetry.io/otel/label package. (#1244)
• The go.opentelemetry.io/otel/api/global packages global TextMapPropagator now delegates functionality to a globally set delegate for all previously returned propagators. (#1258)
• Fix condition in label.Any. (#1299)
• Fix global TracerProvider to pass options to its configured provider. (#1329)
• Fix missing handler for ExactKind aggregator in OTLP metrics transformer (#1309)

0.13.0 - 2020-10-08

Added

• OTLP Metric exporter supports Histogram aggregation. (#1209)
• The Code struct from the go.opentelemetry.io/otel/codes package now supports JSON marshaling and unmarshaling as well as implements the Stringer interface. (#1214)
• A Baggage API to implement the OpenTelemetry specification. (#1217)
• Add Shutdown method to sdk/trace/provider, shutdown processors in the order they were registered. (#1227)

Changed

• Set default propagator to no-op propagator. (#1184)
• The HTTPSupplier, HTTPExtractor, HTTPInjector, and HTTPPropagator from the go.opentelemetry.io/otel/api/propagation package were replaced with unified TextMapCarrier and TextMapPropagator in the go.opentelemetry.io/otel/propagation package. (#1212) (#1325)
• The New function from the go.opentelemetry.io/otel/api/propagation package was replaced with NewCompositeTextMapPropagator in the go.opentelemetry.io/otel package. (#1212)
• The status codes of the go.opentelemetry.io/otel/codes package have been updated to match the latest OpenTelemetry specification. They now are Unset, Error, and Ok. They no longer track the gRPC codes. (#1214)
• The StatusCode field of the SpanData struct in the go.opentelemetry.io/otel/sdk/export/trace package now uses the codes package from this package instead of the gRPC project. (#1214)
• Move the go.opentelemetry.io/otel/api/baggage package into go.opentelemetry.io/otel/baggage. (#1217) (#1325)
• A Shutdown method of SpanProcessor and all its implementations receives a context and returns an error. (#1264)

Fixed

• Copies of data from arrays and slices passed to go.opentelemetry.io/otel/label.ArrayValue() are now used in the returned Value instead of using the mutable data itself. (#1226)

Removed

• The ExtractHTTP and InjectHTTP functions from the go.opentelemetry.io/otel/api/propagation package were removed. (#1212)
• The Propagators interface from the go.opentelemetry.io/otel/api/propagation package was removed to conform to the OpenTelemetry specification. The explicit TextMapPropagator type can be used in its place as this is the Propagator type the specification defines. (#1212)
• The SetAttribute method of the Span from the go.opentelemetry.io/otel/api/trace package was removed given its redundancy with the SetAttributes method. (#1216)
• The internal implementation of Baggage storage is removed in favor of using the new Baggage API functionality. (#1217)
• Remove duplicate hostname key HostHostNameKey in Resource semantic conventions. (#1219)
• Nested array/slice support has been removed. (#1226)

0.12.0 - 2020-09-24

Added

• A SpanConfigure function in go.opentelemetry.io/otel/api/trace to create a new SpanConfig from SpanOptions. (#1108)
• In the go.opentelemetry.io/otel/api/trace package, NewTracerConfig was added to construct new TracerConfigs. This addition was made to conform with our project option conventions. (#1155)
• Instrumentation library information was added to the Zipkin exporter. (#1119)
• The SpanProcessor interface now has a ForceFlush() method. (#1166)
• More semantic conventions for k8s as resource attributes. (#1167)

Changed

• Add reconnecting udp connection type to Jaeger exporter. This change adds a new optional implementation of the udp conn interface used to detect changes to an agent's host dns record. It then adopts the new destination address to ensure the exporter doesn't get stuck. This change was ported from jaegertracing/jaeger-client-go#520. (#1063)
• Replace StartOption and EndOption in go.opentelemetry.io/otel/api/trace with SpanOption. This change is matched by replacing the StartConfig and EndConfig with a unified SpanConfig. (#1108)
• Replace the LinkedTo span option in go.opentelemetry.io/otel/api/trace with WithLinks. This is be more consistent with our other option patterns, i.e. passing the item to be configured directly instead of its component parts, and provides a cleaner function signature. (#1108)
• The go.opentelemetry.io/otel/api/trace TracerOption was changed to an interface to conform to project option conventions. (#1109)
• Move the B3 and TraceContext from within the go.opentelemetry.io/otel/api/trace package to their own go.opentelemetry.io/otel/propagators package. This removal of the propagators is reflective of the OpenTelemetry specification for these propagators as well as cleans up the go.opentelemetry.io/otel/api/trace API. (#1118)
• Rename Jaeger tags used for instrumentation library information to reflect changes in OpenTelemetry specification. (#1119)
• Rename ProbabilitySampler to TraceIDRatioBased and change semantics to ignore parent span sampling status. (#1115)
• Move tools package under internal. (#1141)
• Move go.opentelemetry.io/otel/api/correlation package to go.opentelemetry.io/otel/api/baggage. (#1142) The correlation.CorrelationContext propagator has been renamed baggage.Baggage. Other exported functions and types are unchanged.
• Rename ParentOrElse sampler to ParentBased and allow setting samplers depending on parent span. (#1153)
• In the go.opentelemetry.io/otel/api/trace package, SpanConfigure was renamed to NewSpanConfig. (#1155)
• Change dependabot.yml to add a Skip Changelog label to dependabot-sourced PRs. (#1161)
• The configuration style guide has been updated to recommend the use of newConfig() instead of configure(). (#1163)
• The otlp.Config type has been unexported and changed to otlp.config, along with its initializer. (#1163)
• Ensure exported interface types include parameter names and update the Style Guide to reflect this styling rule. (#1172)
• Don't consider unset environment variable for resource detection to be an error. (#1170)
• Rename go.opentelemetry.io/otel/api/metric.ConfigureInstrument to NewInstrumentConfig and go.opentelemetry.io/otel/api/metric.ConfigureMeter to NewMeterConfig.
• ValueObserver instruments use LastValue aggregator by default. (#1165)
• OTLP Metric exporter supports LastValue aggregation. (#1165)
• Move the go.opentelemetry.io/otel/api/unit package to go.opentelemetry.io/otel/unit. (#1185)
• Rename Provider to MeterProvider in the go.opentelemetry.io/otel/api/metric package. (#1190)
• Rename NoopProvider to NoopMeterProvider in the go.opentelemetry.io/otel/api/metric package. (#1190)
• Rename NewProvider to NewMeterProvider in the go.opentelemetry.io/otel/api/metric/metrictest package. (#1190)
• Rename Provider to MeterProvider in the go.opentelemetry.io/otel/api/metric/registry package. (#1190)
• Rename NewProvider to NewMeterProvider in the go.opentelemetry.io/otel/api/metri/registryc package. (#1190)
• Rename Provider to TracerProvider in the go.opentelemetry.io/otel/api/trace package. (#1190)
• Rename NoopProvider to NoopTracerProvider in the go.opentelemetry.io/otel/api/trace package. (#1190)
• Rename Provider to TracerProvider in the go.opentelemetry.io/otel/api/trace/tracetest package. (#1190)
• Rename NewProvider to NewTracerProvider in the go.opentelemetry.io/otel/api/trace/tracetest package. (#1190)
• Rename WrapperProvider to WrapperTracerProvider in the go.opentelemetry.io/otel/bridge/opentracing package. (#1190)
• Rename NewWrapperProvider to NewWrapperTracerProvider in the go.opentelemetry.io/otel/bridge/opentracing package. (#1190)
• Rename Provider method of the pull controller to MeterProvider in the go.opentelemetry.io/otel/sdk/metric/controller/pull package. (#1190)
• Rename Provider method of the push controller to MeterProvider in the go.opentelemetry.io/otel/sdk/metric/controller/push package. (#1190)
• Rename ProviderOptions to TracerProviderConfig in the go.opentelemetry.io/otel/sdk/trace package. (#1190)
• Rename ProviderOption to TracerProviderOption in the go.opentelemetry.io/otel/sdk/trace package. (#1190)
• Rename Provider to TracerProvider in the go.opentelemetry.io/otel/sdk/trace package. (#1190)
• Rename NewProvider to NewTracerProvider in the go.opentelemetry.io/otel/sdk/trace package. (#1190)
• Renamed SamplingDecision values to comply with OpenTelemetry specification change. (#1192)
• Renamed Zipkin attribute names from ot.status_code & ot.status_description to otel.status_code & otel.status_description. (#1201)
• The default SDK now invokes registered SpanProcessors in the order they were registered with the TracerProvider. (#1195)
• Add test of spans being processed by the SpanProcessors in the order they were registered. (#1203)

Removed

• Remove the B3 propagator from go.opentelemetry.io/otel/propagators. It is now located in the go.opentelemetry.io/contrib/propagators/ module. (#1191)
• Remove the semantic convention for HTTP status text, HTTPStatusTextKey from package go.opentelemetry.io/otel/semconv. (#1194)

Fixed

• Zipkin example no longer mentions ParentSampler, corrected to ParentBased. (#1171)
• Fix missing shutdown processor in otel-collector example. (#1186)
• Fix missing shutdown processor in basic and namedtracer examples. (#1197)

0.11.0 - 2020-08-24

Added

• Support for exporting array-valued attributes via OTLP. (#992)
• Noop and InMemory SpanBatcher implementations to help with testing integrations. (#994)
• Support for filtering metric label sets. (#1047)
• A dimensionality-reducing metric Processor. (#1057)
• Integration tests for more OTel Collector Attribute types. (#1062)
• A new WithSpanProcessor ProviderOption is added to the go.opentelemetry.io/otel/sdk/trace package to create a Provider and automatically register the SpanProcessor. (#1078)

Changed

• Rename sdk/metric/processor/test to sdk/metric/processor/processortest. (#1049)
• Rename sdk/metric/controller/test to sdk/metric/controller/controllertest. (#1049)
• Rename api/testharness to api/apitest. (#1049)
• Rename api/trace/testtrace to api/trace/tracetest. (#1049)
• Change Metric Processor to merge multiple observations. (#1024)
• The go.opentelemetry.io/otel/bridge/opentracing bridge package has been made into its own module. This removes the package dependencies of this bridge from the rest of the OpenTelemetry based project. (#1038)
• Renamed go.opentelemetry.io/otel/api/standard package to go.opentelemetry.io/otel/semconv to avoid the ambiguous and generic name standard and better describe the package as containing OpenTelemetry semantic conventions. (#1016)
• The environment variable used for resource detection has been changed from OTEL_RESOURCE_LABELS to OTEL_RESOURCE_ATTRIBUTES (#1042)
• Replace WithSyncer with WithBatcher in examples. (#1044)
• Replace the google.golang.org/grpc/codes dependency in the API with an equivalent go.opentelemetry.io/otel/codes package. (#1046)
• Merge the go.opentelemetry.io/otel/api/label and go.opentelemetry.io/otel/api/kv into the new go.opentelemetry.io/otel/label package. (#1060)
• Unify Callback Function Naming. Rename *Callback with *Func. (#1061)
• CI builds validate against last two versions of Go, dropping 1.13 and adding 1.15. (#1064)
• The go.opentelemetry.io/otel/sdk/export/trace interfaces SpanSyncer and SpanBatcher have been replaced with a specification compliant Exporter interface. This interface still supports the export of SpanData, but only as a slice. Implementation are also required now to return any error from ExportSpans if one occurs as well as implement a Shutdown method for exporter clean-up. (#1078)
• The go.opentelemetry.io/otel/sdk/trace NewBatchSpanProcessor function no longer returns an error. If a nil exporter is passed as an argument to this function, instead of it returning an error, it now returns a BatchSpanProcessor that handles the export of SpanData by not taking any action. (#1078)
• The go.opentelemetry.io/otel/sdk/trace NewProvider function to create a Provider no longer returns an error, instead only a *Provider. This change is related to NewBatchSpanProcessor not returning an error which was the only error this function would return. (#1078)

Removed

• Duplicate, unused API sampler interface. (#999) Use the Sampler interface provided by the SDK instead.
• The grpctrace instrumentation was moved to the go.opentelemetry.io/contrib repository and out of this repository. This move includes moving the grpc example to the go.opentelemetry.io/contrib as well. (#1027)
• The WithSpan method of the Tracer interface. The functionality this method provided was limited compared to what a user can provide themselves. It was removed with the understanding that if there is sufficient user need it can be added back based on actual user usage. (#1043)
• The RegisterSpanProcessor and UnregisterSpanProcessor functions. These were holdovers from an approach prior to the TracerProvider design. They were not used anymore. (#1077)
• The oterror package. (#1026)
• The othttp and httptrace instrumentations were moved to go.opentelemetry.io/contrib. (#1032)

Fixed

• The semconv.HTTPServerMetricAttributesFromHTTPRequest() function no longer generates the high-cardinality http.request.content.length label. (#1031)
• Correct instrumentation version tag in Jaeger exporter. (#1037)
• The SDK span will now set an error event if the End method is called during a panic (i.e. it was deferred). (#1043)
• Move internally generated protobuf code from the go.opentelemetry.io/otel to the OTLP exporter to reduce dependency overhead. (#1050)
• The otel-collector example referenced outdated collector processors. (#1006)

0.10.0 - 2020-07-29

This release migrates the default OpenTelemetry SDK into its own Go module, decoupling the SDK from the API and reducing dependencies for instrumentation packages.

Added

• The Zipkin exporter now has NewExportPipeline and InstallNewPipeline constructor functions to match the common pattern. These function build a new exporter with default SDK options and register the exporter with the global package respectively. (#944)
• Add propagator option for gRPC instrumentation. (#986)
• The testtrace package now tracks the trace.SpanKind for each span. (#987)

Changed

• Replace the RegisterGlobal Option in the Jaeger exporter with an InstallNewPipeline constructor function. This matches the other exporter constructor patterns and will register a new exporter after building it with default configuration. (#944)
• The trace (go.opentelemetry.io/otel/exporters/trace/stdout) and metric (go.opentelemetry.io/otel/exporters/metric/stdout) stdout exporters are now merged into a single exporter at go.opentelemetry.io/otel/exporters/stdout. This new exporter was made into its own Go module to follow the pattern of all exporters and decouple it from the go.opentelemetry.io/otel module. (#956, #963)
• Move the go.opentelemetry.io/otel/exporters/test test package to go.opentelemetry.io/otel/sdk/export/metric/metrictest. (#962)
• The go.opentelemetry.io/otel/api/kv/value package was merged into the parent go.opentelemetry.io/otel/api/kv package. (#968)
  • value.Bool was replaced with kv.BoolValue.
  • value.Int64 was replaced with kv.Int64Value.
  • value.Uint64 was replaced with kv.Uint64Value.
  • value.Float64 was replaced with kv.Float64Value.
  • value.Int32 was replaced with kv.Int32Value.
  • value.Uint32 was replaced with kv.Uint32Value.
  • value.Float32 was replaced with kv.Float32Value.
  • value.String was replaced with kv.StringValue.
  • value.Int was replaced with kv.IntValue.
  • value.Uint was replaced with kv.UintValue.
  • value.Array was replaced with kv.ArrayValue.
• Rename Infer to Any in the go.opentelemetry.io/otel/api/kv package. (#972)
• Change othttp to use the httpsnoop package to wrap the ResponseWriter so that optional interfaces (http.Hijacker, http.Flusher, etc.) that are implemented by the original ResponseWriterare also implemented by the wrapped ResponseWriter. (#979)
• Rename go.opentelemetry.io/otel/sdk/metric/aggregator/test package to go.opentelemetry.io/otel/sdk/metric/aggregator/aggregatortest. (#980)
• Make the SDK into its own Go module called go.opentelemetry.io/otel/sdk. (#985)
• Changed the default trace Sampler from AlwaysOn to ParentOrElse(AlwaysOn). (#989)

Removed

• The IndexedAttribute function from the go.opentelemetry.io/otel/api/label package was removed in favor of IndexedLabel which it was synonymous with. (#970)

Fixed

• Bump github.com/golangci/golangci-lint from 1.28.3 to 1.29.0 in /tools. (#953)
• Bump github.com/google/go-cmp from 0.5.0 to 0.5.1. (#957)
• Use global.Handle for span export errors in the OTLP exporter. (#946)
• Correct Go language formatting in the README documentation. (#961)
• Remove default SDK dependencies from the go.opentelemetry.io/otel/api package. (#977)
• Remove default SDK dependencies from the go.opentelemetry.io/otel/instrumentation package. (#983)
• Move documented examples for go.opentelemetry.io/otel/instrumentation/grpctrace interceptors into Go example tests. (#984)

0.9.0 - 2020-07-20

Added

• A new Resource Detector interface is included to allow resources to be automatically detected and included. (#939)
• A Detector to automatically detect resources from an environment variable. (#939)
• Github action to generate protobuf Go bindings locally in internal/opentelemetry-proto-gen. (#938)
• OTLP .proto files from open-telemetry/opentelemetry-proto imported as a git submodule under internal/opentelemetry-proto. References to github.com/open-telemetry/opentelemetry-proto changed to go.opentelemetry.io/otel/internal/opentelemetry-proto-gen. (#942)

Changed

• Non-nil value structs for key-value pairs will be marshalled using JSON rather than Sprintf. (#948)

Removed

• Removed dependency on github.com/open-telemetry/opentelemetry-collector. (#943)

0.8.0 - 2020-07-09

Added

• The B3Encoding type to represent the B3 encoding(s) the B3 propagator can inject. A value for HTTP supported encodings (Multiple Header: MultipleHeader, Single Header: SingleHeader) are included. (#882)
• The FlagsDeferred trace flag to indicate if the trace sampling decision has been deferred. (#882)
• The FlagsDebug trace flag to indicate if the trace is a debug trace. (#882)
• Add peer.service semantic attribute. (#898)
• Add database-specific semantic attributes. (#899)
• Add semantic convention for faas.coldstart and container.id. (#909)
• Add http content size semantic conventions. (#905)
• Include http.request_content_length in HTTP request basic attributes. (#905)
• Add semantic conventions for operating system process resource attribute keys. (#919)
• The Jaeger exporter now has a WithBatchMaxCount option to specify the maximum number of spans sent in a batch. (#931)

Changed

• Update CONTRIBUTING.md to ask for updates to CHANGELOG.md with each pull request. (#879)
• Use lowercase header names for B3 Multiple Headers. (#881)
• The B3 propagator SingleHeader field has been replaced with InjectEncoding. This new field can be set to combinations of the B3Encoding bitmasks and will inject trace information in these encodings. If no encoding is set, the propagator will default to MultipleHeader encoding. (#882)
• The B3 propagator now extracts from either HTTP encoding of B3 (Single Header or Multiple Header) based on what is contained in the header. Preference is given to Single Header encoding with Multiple Header being the fallback if Single Header is not found or is invalid. This behavior change is made to dynamically support all correctly encoded traces received instead of having to guess the expected encoding prior to receiving. (#882)
• Extend semantic conventions for RPC. (#900)
• To match constant naming conventions in the api/standard package, the FaaS* key names are appended with a suffix of Key. (#920)
  • "api/standard".FaaSName -> FaaSNameKey
  • "api/standard".FaaSID -> FaaSIDKey
  • "api/standard".FaaSVersion -> FaaSVersionKey
  • "api/standard".FaaSInstance -> FaaSInstanceKey

Removed

• The FlagsUnused trace flag is removed. The purpose of this flag was to act as the inverse of FlagsSampled, the inverse of FlagsSampled is used instead. (#882)
• The B3 header constants (B3SingleHeader, B3DebugFlagHeader, B3TraceIDHeader, B3SpanIDHeader, B3SampledHeader, B3ParentSpanIDHeader) are removed. If B3 header keys are needed the authoritative OpenZipkin package constants should be used instead. (#882)

Fixed

• The B3 Single Header name is now correctly b3 instead of the previous X-B3. (#881)
• The B3 propagator now correctly supports sampling only values (b3: 0, b3: 1, or b3: d) for a Single B3 Header. (#882)
• The B3 propagator now propagates the debug flag. This removes the behavior of changing the debug flag into a set sampling bit. Instead, this now follow the B3 specification and omits the X-B3-Sampling header. (#882)
• The B3 propagator now tracks "unset" sampling state (meaning "defer the decision") and does not set the X-B3-Sampling header when injecting. (#882)
• Bump github.com/itchyny/gojq from 0.10.3 to 0.10.4 in /tools. (#883)
• Bump github.com/opentracing/opentracing-go from v1.1.1-0.20190913142402-a7454ce5950e to v1.2.0. (#885)
• The tracing time conversion for OTLP spans is now correctly set to UnixNano. (#896)
• Ensure span status is not set to Unknown when no HTTP status code is provided as it is assumed to be 200 OK. (#908)
• Ensure httptrace.clientTracer closes http.headers span. (#912)
• Prometheus exporter will not apply stale updates or forget inactive metrics. (#903)
• Add test for api.standard HTTPClientAttributesFromHTTPRequest. (#905)
• Bump github.com/golangci/golangci-lint from 1.27.0 to 1.28.1 in /tools. (#901, #913)
• Update otel-colector example to use the v0.5.0 collector. (#915)
• The grpctrace instrumentation uses a span name conforming to the OpenTelemetry semantic conventions (does not contain a leading slash (/)). (#922)
• The grpctrace instrumentation includes an rpc.method attribute now set to the gRPC method name. (#900, #922)
• The grpctrace instrumentation rpc.service attribute now contains the package name if one exists. This is in accordance with OpenTelemetry semantic conventions. (#922)
• Correlation Context extractor will no longer insert an empty map into the returned context when no valid values are extracted. (#923)
• Bump google.golang.org/api from 0.28.0 to 0.29.0 in /exporters/trace/jaeger. (#925)
• Bump github.com/itchyny/gojq from 0.10.4 to 0.11.0 in /tools. (#926)
• Bump github.com/golangci/golangci-lint from 1.28.1 to 1.28.2 in /tools. (#930)

0.7.0 - 2020-06-26

This release implements the v0.5.0 version of the OpenTelemetry specification.

Added

• The othttp instrumentation now includes default metrics. (#861)
• This CHANGELOG file to track all changes in the project going forward.
• Support for array type attributes. (#798)
• Apply transitive dependabot go.mod dependency updates as part of a new automatic Github workflow. (#844)
• Timestamps are now passed to exporters for each export. (#835)
• Add new Accumulation type to metric SDK to transport telemetry from Accumulators to Processors. This replaces the prior Record struct use for this purpose. (#835)
• New dependabot integration to automate package upgrades. (#814)
• Meter and Tracer implementations accept instrumentation version version as an optional argument. This instrumentation version is passed on to exporters. (#811) (#805) (#802)
• The OTLP exporter includes the instrumentation version in telemetry it exports. (#811)
• Environment variables for Jaeger exporter are supported. (#796)
• New aggregation.Kind in the export metric API. (#808)
• New example that uses OTLP and the collector. (#790)
• Handle errors in the span SetName during span initialization. (#791)
• Default service config to enable retries for retry-able failed requests in the OTLP exporter and an option to override this default. (#777)
• New go.opentelemetry.io/otel/api/oterror package to uniformly support error handling and definitions for the project. (#778)
• New global default implementation of the go.opentelemetry.io/otel/api/oterror.Handler interface to be used to handle errors prior to an user defined Handler. There is also functionality for the user to register their Handler as well as a convenience function Handle to handle an error with this global Handler(#778)
• Options to specify propagators for httptrace and grpctrace instrumentation. (#784)
• The required application/json header for the Zipkin exporter is included in all exports. (#774)
• Integrate HTTP semantics helpers from the contrib repository into the api/standard package. #769

Changed

• Rename Integrator to Processor in the metric SDK. (#863)
• Rename AggregationSelector to AggregatorSelector. (#859)
• Rename SynchronizedCopy to SynchronizedMove. (#858)
• Rename simple integrator to basic integrator. (#857)
• Merge otlp collector examples. (#841)
• Change the metric SDK to support cumulative, delta, and pass-through exporters directly. With these changes, cumulative and delta specific exporters are able to request the correct kind of aggregation from the SDK. (#840)
• The Aggregator.Checkpoint API is renamed to SynchronizedCopy and adds an argument, a different Aggregator into which the copy is stored. (#812)
• The export.Aggregator contract is that Update() and SynchronizedCopy() are synchronized with each other. All the aggregation interfaces (Sum, LastValue, ...) are not meant to be synchronized, as the caller is expected to synchronize aggregators at a higher level after the Accumulator. Some of the Aggregators used unnecessary locking and that has been cleaned up. (#812)
• Use of metric.Number was replaced by int64 now that we use sync.Mutex in the MinMaxSumCount and Histogram Aggregators. (#812)
• Replace AlwaysParentSample with ParentSample(fallback) to match the OpenTelemetry v0.5.0 specification. (#810)
• Rename sdk/export/metric/aggregator to sdk/export/metric/aggregation. #808
• Send configured headers with every request in the OTLP exporter, instead of just on connection creation. (#806)
• Update error handling for any one off error handlers, replacing, instead, with the global.Handle function. (#791)
• Rename plugin directory to instrumentation to match the OpenTelemetry specification. (#779)
• Makes the argument order to Histogram and DDSketch New() consistent. (#781)

Removed

• Uint64NumberKind and related functions from the API. (#864)
• Context arguments from Aggregator.Checkpoint and Integrator.Process as they were unused. (#803)
• SpanID is no longer included in parameters for sampling decision to match the OpenTelemetry specification. (#775)

Fixed

• Upgrade OTLP exporter to opentelemetry-proto matching the opentelemetry-collector v0.4.0 release. (#866)
• Allow changes to go.sum and go.mod when running dependabot tidy-up. (#871)
• Bump github.com/stretchr/testify from 1.4.0 to 1.6.1. (#824)
• Bump github.com/prometheus/client_golang from 1.7.0 to 1.7.1 in /exporters/metric/prometheus. (#867)
• Bump google.golang.org/grpc from 1.29.1 to 1.30.0 in /exporters/trace/jaeger. (#853)
• Bump google.golang.org/grpc from 1.29.1 to 1.30.0 in /exporters/trace/zipkin. (#854)
• Bumps github.com/golang/protobuf from 1.3.2 to 1.4.2 (#848)
• Bump github.com/stretchr/testify from 1.4.0 to 1.6.1 in /exporters/otlp (#817)
• Bump github.com/golangci/golangci-lint from 1.25.1 to 1.27.0 in /tools (#828)
• Bump github.com/prometheus/client_golang from 1.5.0 to 1.7.0 in /exporters/metric/prometheus (#838)
• Bump github.com/stretchr/testify from 1.4.0 to 1.6.1 in /exporters/trace/jaeger (#829)
• Bump github.com/benbjohnson/clock from 1.0.0 to 1.0.3 (#815)
• Bump github.com/stretchr/testify from 1.4.0 to 1.6.1 in /exporters/trace/zipkin (#823)
• Bump github.com/itchyny/gojq from 0.10.1 to 0.10.3 in /tools (#830)
• Bump github.com/stretchr/testify from 1.4.0 to 1.6.1 in /exporters/metric/prometheus (#822)
• Bump google.golang.org/grpc from 1.27.1 to 1.29.1 in /exporters/trace/zipkin (#820)
• Bump google.golang.org/grpc from 1.27.1 to 1.29.1 in /exporters/trace/jaeger (#831)
• Bump github.com/google/go-cmp from 0.4.0 to 0.5.0 (#836)
• Bump github.com/google/go-cmp from 0.4.0 to 0.5.0 in /exporters/trace/jaeger (#837)
• Bump github.com/google/go-cmp from 0.4.0 to 0.5.0 in /exporters/otlp (#839)
• Bump google.golang.org/api from 0.20.0 to 0.28.0 in /exporters/trace/jaeger (#843)
• Set span status from HTTP status code in the othttp instrumentation. (#832)
• Fixed typo in push controller comment. (#834)
• The Aggregator testing has been updated and cleaned. (#812)
• metric.Number(0) expressions are replaced by 0 where possible. (#812)
• Fixed global handler_test.go test failure. #804
• Fixed BatchSpanProcessor.Shutdown to wait until all spans are processed. (#766)
• Fixed OTLP example's accidental early close of exporter. (#807)
• Ensure zipkin exporter reads and closes response body. (#788)
• Update instrumentation to use api/standard keys instead of custom keys. (#782)
• Clean up tools and RELEASING documentation. (#762)

0.6.0 - 2020-05-21

Added

• Support for Resources in the prometheus exporter. (#757)
• New pull controller. (#751)
• New UpDownSumObserver instrument. (#750)
• OpenTelemetry collector demo. (#711)
• New SumObserver instrument. (#747)
• New UpDownCounter instrument. (#745)
• New timeout Option and configuration function WithTimeout to the push controller. (#742)
• New api/standards package to implement semantic conventions and standard key-value generation. (#731)

Changed

• Rename Register* functions in the metric API to New* for all Observer instruments. (#761)
• Use []float64 for histogram boundaries, not []metric.Number. (#758)
• Change OTLP example to use exporter as a trace Syncer instead of as an unneeded Batcher. (#756)
• Replace WithResourceAttributes() with WithResource() in the trace SDK. (#754)
• The prometheus exporter now uses the new pull controller. (#751)
• Rename ScheduleDelayMillis to BatchTimeout in the trace BatchSpanProcessor.(#752)
• Support use of synchronous instruments in asynchronous callbacks (#725)
• Move Resource from the Export method parameter into the metric export Record. (#739)
• Rename Observer instrument to ValueObserver. (#734)
• The push controller now has a method (Provider()) to return a metric.Provider instead of the old Meter method that acted as a metric.Provider. (#738)
• Replace Measure instrument by ValueRecorder instrument. (#732)
• Rename correlation context header from "Correlation-Context" to "otcorrelations" to match the OpenTelemetry specification. (#727)

Fixed

• Ensure gRPC ClientStream override methods do not panic in grpctrace package. (#755)
• Disable parts of BatchSpanProcessor test until a fix is found. (#743)
• Fix string case in kv Infer function. (#746)
• Fix panic in grpctrace client interceptors. (#740)
• Refactor the api/metrics push controller and add CheckpointSet synchronization. (#737)
• Rewrite span batch process queue batching logic. (#719)
• Remove the push controller named Meter map. (#738)
• Fix Histogram aggregator initial state (fix #735). (#736)
• Ensure golang alpine image is running golang-1.14 for examples. (#733)
• Added test for grpctrace UnaryInterceptorClient. (#695)
• Rearrange api/metric code layout. (#724)

0.5.0 - 2020-05-13

Added

• Batch Observer callback support. (#717)
• Alias api types to root package of project. (#696)
• Create basic othttp.Transport for simple client instrumentation. (#678)
• SetAttribute(string, interface{}) to the trace API. (#674)
• Jaeger exporter option that allows user to specify custom http client. (#671)
• Stringer and Infer methods to keys. (#662)

Changed

• Rename NewKey in the kv package to just Key. (#721)
• Move core and key to kv package. (#720)
• Make the metric API Meter a struct so the abstract MeterImpl can be passed and simplify implementation. (#709)
• Rename SDK Batcher to Integrator to match draft OpenTelemetry SDK specification. (#710)
• Rename SDK Ungrouped integrator to simple.Integrator to match draft OpenTelemetry SDK specification. (#710)
• Rename SDK SDK struct to Accumulator to match draft OpenTelemetry SDK specification. (#710)
• Move Number from core to api/metric package. (#706)
• Move SpanContext from core to trace package. (#692)
• Change traceparent header from Traceparent to traceparent to implement the W3C specification. (#681)

Fixed

• Update tooling to run generators in all submodules. (#705)
• gRPC interceptor regexp to match methods without a service name. (#683)
• Use a const for padding 64-bit B3 trace IDs. (#701)
• Update mockZipkin listen address from :0 to 127.0.0.1:0. (#700)
• Left-pad 64-bit B3 trace IDs with zero. (#698)
• Propagate at least the first W3C tracestate header. (#694)
• Remove internal StateLocker implementation. (#688)
• Increase instance size CI system uses. (#690)
• Add a key benchmark and use reflection in key.Infer(). (#679)
• Fix internal global test by using global.Meter with RecordBatch(). (#680)
• Reimplement histogram using mutex instead of StateLocker. (#669)
• Switch MinMaxSumCount to a mutex lock implementation instead of StateLocker. (#667)
• Update documentation to not include any references to WithKeys. (#672)
• Correct misspelling. (#668)
• Fix clobbering of the span context if extraction fails. (#656)
• Bump golangci-lint and work around the corrupting bug. (#666) (#670)

0.4.3 - 2020-04-24

Added

• Dockerfile and docker-compose.yml to run example code. (#635)
• New grpctrace package that provides gRPC client and server interceptors for both unary and stream connections. (#621)
• New api/label package, providing common label set implementation. (#651)
• Support for JSON marshaling of Resources. (#654)
• TraceID and SpanID implementations for Stringer interface. (#642)
• RemoteAddrKey in the othttp plugin to include the HTTP client address in top-level spans. (#627)
• WithSpanFormatter option to the othttp plugin. (#617)
• Updated README to include section for compatible libraries and include reference to the contrib repository. (#612)
• The prometheus exporter now supports exporting histograms. (#601)
• A String method to the Resource to return a hashable identifier for a now unique resource. (#613)
• An Iter method to the Resource to return an array AttributeIterator. (#613)
• An Equal method to the Resource test the equivalence of resources. (#613)
• An iterable structure (AttributeIterator) for Resource attributes.

Changed

• zipkin export's NewExporter now requires a serviceName argument to ensure this needed values is provided. (#644)
• Pass Resources through the metrics export pipeline. (#659)

Removed

• WithKeys option from the metric API. (#639)

Fixed

• Use the label.Set.Equivalent value instead of an encoding in the batcher. (#658)
• Correct typo trace.Exporter to trace.SpanSyncer in comments. (#653)
• Use type names for return values in jaeger exporter. (#648)
• Increase the visibility of the api/key package by updating comments and fixing usages locally. (#650)
• Checkpoint only after Update; Keep records in the sync.Map longer. (#647)
• Do not cache reflect.ValueOf() in metric Labels. (#649)
• Batch metrics exported from the OTLP exporter based on Resource and labels. (#626)
• Add error wrapping to the prometheus exporter. (#631)
• Update the OTLP exporter batching of traces to use a unique string representation of an associated Resource as the batching key. (#623)
• Update OTLP SpanData transform to only include the ParentSpanID if one exists. (#614)
• Update Resource internal representation to uniquely and reliably identify resources. (#613)
• Check return value from CheckpointSet.ForEach in prometheus exporter. (#622)
• Ensure spans created by httptrace client tracer reflect operation structure. (#618)
• Create a new recorder rather than reuse when multiple observations in same epoch for asynchronous instruments. #610
• The default port the OTLP exporter uses to connect to the OpenTelemetry collector is updated to match the one the collector listens on by default. (#611)

0.4.2 - 2020-03-31

Fixed

• Fix pre_release.sh to update version in sdk/opentelemetry.go. (#607)
• Fix time conversion from internal to OTLP in OTLP exporter. (#606)

0.4.1 - 2020-03-31

Fixed

• Update tag.sh to create signed tags. (#604)

0.4.0 - 2020-03-30

Added

• New API package api/metric/registry that exposes a MeterImpl wrapper for use by SDKs to generate unique instruments. (#580)
• Script to verify examples after a new release. (#579)

Removed

• The dogstatsd exporter due to lack of support. This additionally removes support for statsd. (#591)
• LabelSet from the metric API. This is replaced by a []core.KeyValue slice. (#595)
• Labels from the metric API's Meter interface. (#595)

Changed

• The metric export.Labels became an interface which the SDK implements and the export package provides a simple, immutable implementation of this interface intended for testing purposes. (#574)
• Renamed internal/metric.Meter to MeterImpl. (#580)
• Renamed api/global/internal.obsImpl to asyncImpl. (#580)

Fixed

• Corrected missing return in mock span. (#582)
• Update License header for all source files to match CNCF guidelines and include a test to ensure it is present. (#586) (#596)
• Update to v0.3.0 of the OTLP in the OTLP exporter. (#588)
• Update pre-release script to be compatible between GNU and BSD based systems. (#592)
• Add a RecordBatch benchmark. (#594)
• Moved span transforms of the OTLP exporter to the internal package. (#593)
• Build both go-1.13 and go-1.14 in circleci to test for all supported versions of Go. (#569)
• Removed unneeded allocation on empty labels in OLTP exporter. (#597)
• Update BatchedSpanProcessor to process the queue until no data but respect max batch size. (#599)
• Update project documentation godoc.org links to pkg.go.dev. (#602)

0.3.0 - 2020-03-21

This is a first official beta release, which provides almost fully complete metrics, tracing, and context propagation functionality. There is still a possibility of breaking changes.

Added

• Add Observer metric instrument. (#474)
• Add global Propagators functionality to enable deferred initialization for propagators registered before the first Meter SDK is installed. (#494)
• Simplified export setup pipeline for the jaeger exporter to match other exporters. (#459)
• The zipkin trace exporter. (#495)
• The OTLP exporter to export metric and trace telemetry to the OpenTelemetry collector. (#497) (#544) (#545)
• Add StatusMessage field to the trace Span. (#524)
• Context propagation in OpenTracing bridge in terms of OpenTelemetry context propagation. (#525)
• The Resource type was added to the SDK. (#528)
• The global API now supports a Tracer and Meter function as shortcuts to getting a global *Provider and calling these methods directly. (#538)
• The metric API now defines a generic MeterImpl interface to support general purpose Meter construction. Additionally, SyncImpl and AsyncImpl are added to support general purpose instrument construction. (#560)
• A metric Kind is added to represent the MeasureKind, ObserverKind, and CounterKind. (#560)
• Scripts to better automate the release process. (#576)

Changed

• Default to to use AlwaysSampler instead of ProbabilitySampler to match OpenTelemetry specification. (#506)
• Renamed AlwaysSampleSampler to AlwaysOnSampler in the trace API. (#511)
• Renamed NeverSampleSampler to AlwaysOffSampler in the trace API. (#511)
• The Status field of the Span was changed to StatusCode to disambiguate with the added StatusMessage. (#524)
• Updated the trace Sampler interface conform to the OpenTelemetry specification. (#531)
• Rename metric API Options to Config. (#541)
• Rename metric Counter aggregator to be Sum. (#541)
• Unify metric options into Option from instrument specific options. (#541)
• The trace API's TraceProvider now support Resources. (#545)
• Correct error in zipkin module name. (#548)
• The jaeger trace exporter now supports Resources. (#551)
• Metric SDK now supports Resources. The WithResource option was added to configure a Resource on creation and the Resource method was added to the metric Descriptor to return the associated Resource. (#552)
• Replace ErrNoLastValue and ErrEmptyDataSet by ErrNoData in the metric SDK. (#557)
• The stdout trace exporter now supports Resources. (#558)
• The metric Descriptor is now included at the API instead of the SDK. (#560)
• Replace Ordered with an iterator in export.Labels. (#567)

Removed

• The vendor specific Stackdriver. It is now hosted on 3rd party vendor infrastructure. (#452)
• The Unregister method for metric observers as it is not in the OpenTelemetry specification. (#560)
• GetDescriptor from the metric SDK. (#575)
• The Gauge instrument from the metric API. (#537)

Fixed

• Make histogram aggregator checkpoint consistent. (#438)
• Update README with import instructions and how to build and test. (#505)
• The default label encoding was updated to be unique. (#508)
• Use NewRoot in the othttp plugin for public endpoints. (#513)
• Fix data race in BatchedSpanProcessor. (#518)
• Skip test-386 for Mac OS 10.15.x (Catalina and upwards). #521
• Use a variable-size array to represent ordered labels in maps. (#523)
• Update the OTLP protobuf and update changed import path. (#532)
• Use StateLocker implementation in MinMaxSumCount. (#546)
• Eliminate goroutine leak in histogram stress test. (#547)
• Update OTLP exporter with latest protobuf. (#550)
• Add filters to the othttp plugin. (#556)
• Provide an implementation of the Header* filters that do not depend on Go 1.14. (#565)
• Encode labels once during checkpoint. The checkpoint function is executed in a single thread so we can do the encoding lazily before passing the encoded version of labels to the exporter. This is a cheap and quick way to avoid encoding the labels on every collection interval. (#572)
• Run coverage over all packages in COVERAGE_MOD_DIR. (#573)

0.2.3 - 2020-03-04

Added

• RecordError method on Spans in the trace API to Simplify adding error events to spans. (#473)
• Configurable push frequency for exporters setup pipeline. (#504)

Changed

• Rename the exporter directory to exporters. The go.opentelemetry.io/otel/exporter/trace/jaeger package was mistakenly released with a v1.0.0 tag instead of v0.1.0. This resulted in all subsequent releases not becoming the default latest. A consequence of this was that all go gets pulled in the incompatible v0.1.0 release of that package when pulling in more recent packages from other otel packages. Renaming the exporter directory to exporters fixes this issue by renaming the package and therefore clearing any existing dependency tags. Consequentially, this action also renames all exporter packages. (#502)

Removed

• The CorrelationContextHeader constant in the correlation package is no longer exported. (#503)

0.2.2 - 2020-02-27

Added

• HTTPSupplier interface in the propagation API to specify methods to retrieve and store a single value for a key to be associated with a carrier. (#467)
• HTTPExtractor interface in the propagation API to extract information from an HTTPSupplier into a context. (#467)
• HTTPInjector interface in the propagation API to inject information into an HTTPSupplier. (#467)
• Config and configuring Option to the propagator API. (#467)
• Propagators interface in the propagation API to contain the set of injectors and extractors for all supported carrier formats. (#467)
• HTTPPropagator interface in the propagation API to inject and extract from an HTTPSupplier. (#467)
• WithInjectors and WithExtractors functions to the propagator API to configure injectors and extractors to use. (#467)
• ExtractHTTP and InjectHTTP functions to apply configured HTTP extractors and injectors to a passed context. (#467)
• Histogram aggregator. (#433)
• DefaultPropagator function and have it return trace.TraceContext as the default context propagator. (#456)
• AlwaysParentSample sampler to the trace API. (#455)
• WithNewRoot option function to the trace API to specify the created span should be considered a root span. (#451)

Changed

• Renamed WithMap to ContextWithMap in the correlation package. (#481)
• Renamed FromContext to MapFromContext in the correlation package. (#481)
• Move correlation context propagation to correlation package. (#479)
• Do not default to putting remote span context into links. (#480)
• Tracer.WithSpan updated to accept StartOptions. (#472)
• Renamed MetricKind to Kind to not stutter in the type usage. (#432)
• Renamed the export package to metric to match directory structure. (#432)
• Rename the api/distributedcontext package to api/correlation. (#444)
• Rename the api/propagators package to api/propagation. (#444)
• Move the propagators from the propagators package into the trace API package. (#444)
• Update Float64Gauge, Int64Gauge, Float64Counter, Int64Counter, Float64Measure, and Int64Measure metric methods to use value receivers instead of pointers. (#462)
• Moved all dependencies of tools package to a tools directory. (#466)

Removed

• Binary propagators. (#467)
• NOOP propagator. (#467)

Fixed

• Upgraded github.com/golangci/golangci-lint from v1.21.0 to v1.23.6 in tools/. (#492)
• Fix a possible nil-dereference crash (#478)
• Correct comments for InstallNewPipeline in the stdout exporter. (#483)
• Correct comments for InstallNewPipeline in the dogstatsd exporter. (#484)
• Correct comments for InstallNewPipeline in the prometheus exporter. (#482)
• Initialize onError based on Config in prometheus exporter. (#486)
• Correct module name in prometheus exporter README. (#475)
• Removed tracer name prefix from span names. (#430)
• Fix aggregator_test.go import package comment. (#431)
• Improved detail in stdout exporter. (#436)
• Fix a dependency issue (generate target should depend on stringer, not lint target) in Makefile. (#442)
• Reorders the Makefile targets within precommit target so we generate files and build the code before doing linting, so we can get much nicer errors about syntax errors from the compiler. (#442)
• Reword function documentation in gRPC plugin. (#446)
• Send the span.kind tag to Jaeger from the jaeger exporter. (#441)
• Fix metadataSupplier in the jaeger exporter to overwrite the header if existing instead of appending to it. (#441)
• Upgraded to Go 1.13 in CI. (#465)
• Correct opentelemetry.io URL in trace SDK documentation. (#464)
• Refactored reference counting logic in SDK determination of stale records. (#468)
• Add call to runtime.Gosched in instrument acquireHandle logic to not block the collector. (#469)

0.2.1.1 - 2020-01-13

Fixed

• Use stateful batcher on Prometheus exporter fixing regresion introduced in #395. (#428)

0.2.1 - 2020-01-08

Added

• Global meter forwarding implementation. This enables deferred initialization for metric instruments registered before the first Meter SDK is installed. (#392)
• Global trace forwarding implementation. This enables deferred initialization for tracers registered before the first Trace SDK is installed. (#406)
• Standardize export pipeline creation in all exporters. (#395)
• A testing, organization, and comments for 64-bit field alignment. (#418)
• Script to tag all modules in the project. (#414)

Changed

• Renamed propagation package to propagators. (#362)
• Renamed B3Propagator propagator to B3. (#362)
• Renamed TextFormatPropagator propagator to TextFormat. (#362)
• Renamed BinaryPropagator propagator to Binary. (#362)
• Renamed BinaryFormatPropagator propagator to BinaryFormat. (#362)
• Renamed NoopTextFormatPropagator propagator to NoopTextFormat. (#362)
• Renamed TraceContextPropagator propagator to TraceContext. (#362)
• Renamed SpanOption to StartOption in the trace API. (#369)
• Renamed StartOptions to StartConfig in the trace API. (#369)
• Renamed EndOptions to EndConfig in the trace API. (#369)
• Number now has a pointer receiver for its methods. (#375)
• Renamed CurrentSpan to SpanFromContext in the trace API. (#379)
• Renamed SetCurrentSpan to ContextWithSpan in the trace API. (#379)
• Renamed Message in Event to Name in the trace API. (#389)
• Prometheus exporter no longer aggregates metrics, instead it only exports them. (#385)
• Renamed HandleImpl to BoundInstrumentImpl in the metric API. (#400)
• Renamed Float64CounterHandle to Float64CounterBoundInstrument in the metric API. (#400)
• Renamed Int64CounterHandle to Int64CounterBoundInstrument in the metric API. (#400)
• Renamed Float64GaugeHandle to Float64GaugeBoundInstrument in the metric API. (#400)
• Renamed Int64GaugeHandle to Int64GaugeBoundInstrument in the metric API. (#400)
• Renamed Float64MeasureHandle to Float64MeasureBoundInstrument in the metric API. (#400)
• Renamed Int64MeasureHandle to Int64MeasureBoundInstrument in the metric API. (#400)
• Renamed Release method for bound instruments in the metric API to Unbind. (#400)
• Renamed AcquireHandle method for bound instruments in the metric API to Bind. (#400)
• Renamed the File option in the stdout exporter to Writer. (#404)
• Renamed all Options to Config for all metric exports where this wasn't already the case.

Fixed

• Aggregator import path corrected. (#421)
• Correct links in README. (#368)
• The README was updated to match latest code changes in its examples. (#374)
• Don't capitalize error statements. (#375)
• Fix ignored errors. (#375)
• Fix ambiguous variable naming. (#375)
• Removed unnecessary type casting. (#375)
• Use named parameters. (#375)
• Updated release schedule. (#378)
• Correct http-stackdriver example module name. (#394)
• Removed the http.request span in httptrace package. (#397)
• Add comments in the metrics SDK (#399)
• Initialize checkpoint when creating ddsketch aggregator to prevent panic when merging into a empty one. (#402) (#403)
• Add documentation of compatible exporters in the README. (#405)
• Typo fix. (#408)
• Simplify span check logic in SDK tracer implementation. (#419)

0.2.0 - 2019-12-03

Added

• Unary gRPC tracing example. (#351)
• Prometheus exporter. (#334)
• Dogstatsd metrics exporter. (#326)

Changed

• Rename MaxSumCount aggregation to MinMaxSumCount and add the Min interface for this aggregation. (#352)
• Rename GetMeter to Meter. (#357)
• Rename HTTPTraceContextPropagator to TraceContextPropagator. (#355)
• Rename HTTPB3Propagator to B3Propagator. (#355)
• Rename HTTPTraceContextPropagator to TraceContextPropagator. (#355)
• Move /global package to /api/global. (#356)
• Rename GetTracer to Tracer. (#347)

Removed

• SetAttribute from the Span interface in the trace API. (#361)
• AddLink from the Span interface in the trace API. (#349)
• Link from the Span interface in the trace API. (#349)

Fixed

• Exclude example directories from coverage report. (#365)
• Lint make target now implements automatic fixes with golangci-lint before a second run to report the remaining issues. (#360)
• Drop GO111MODULE environment variable in Makefile as Go 1.13 is the project specified minimum version and this is environment variable is not needed for that version of Go. (#359)
• Run the race checker for all test. (#354)
• Redundant commands in the Makefile are removed. (#354)
• Split the generate and lint targets of the Makefile. (#354)
• Renames circle-ci target to more generic ci in Makefile. (#354)
• Add example Prometheus binary to gitignore. (#358)
• Support negative numbers with the MaxSumCount. (#335)
• Resolve race conditions in push_test.go identified in #339. (#340)
• Use /usr/bin/env bash as a shebang in scripts rather than /bin/bash. (#336)
• Trace benchmark now tests both AlwaysSample and NeverSample. Previously it was testing AlwaysSample twice. (#325)
• Trace benchmark now uses a []byte for TraceID to fix failing test. (#325)
• Added a trace benchmark to test variadic functions in setAttribute vs setAttributes (#325)
• The defaultkeys batcher was only using the encoded label set as its map key while building a checkpoint. This allowed distinct label sets through, but any metrics sharing a label set could be overwritten or merged incorrectly. This was corrected. (#333)

0.1.2 - 2019-11-18

Fixed

• Optimized the simplelru map for attributes to reduce the number of allocations. (#328)
• Removed unnecessary unslicing of parameters that are already a slice. (#324)

0.1.1 - 2019-11-18

This release contains a Metrics SDK with stdout exporter and supports basic aggregations such as counter, gauges, array, maxsumcount, and ddsketch.

Added

• Metrics stdout export pipeline. (#265)
• Array aggregation for raw measure metrics. (#282)
• The core.Value now have a MarshalJSON method. (#281)

Removed

• WithService, WithResources, and WithComponent methods of tracers. (#314)
• Prefix slash in Tracer.Start() for the Jaeger example. (#292)

Changed

• Allocation in LabelSet construction to reduce GC overhead. (#318)
• trace.WithAttributes to append values instead of replacing (#315)
• Use a formula for tolerance in sampling tests. (#298)
• Move export types into trace and metric-specific sub-directories. (#289)
• SpanKind back to being based on an int type. (#288)

Fixed

• URL to OpenTelemetry website in README. (#323)
• Name of othttp default tracer. (#321)
• ExportSpans for the stackdriver exporter now handles nil context. (#294)
• CI modules cache to correctly restore/save from/to the cache. (#316)
• Fix metric SDK race condition between LoadOrStore and the assignment rec.recorder = i.meter.exporter.AggregatorFor(rec). (#293)
• README now reflects the new code structure introduced with these changes. (#291)
• Make the basic example work. (#279)

0.1.0 - 2019-11-04

This is the first release of open-telemetry go library. It contains api and sdk for trace and meter.

Added

• Initial OpenTelemetry trace and metric API prototypes.
• Initial OpenTelemetry trace, metric, and export SDK packages.
• A wireframe bridge to support compatibility with OpenTracing.
• Example code for a basic, http-stackdriver, http, jaeger, and named tracer setup.
• Exporters for Jaeger, Stackdriver, and stdout.
• Propagators for binary, B3, and trace-context protocols.
• Project information and guidelines in the form of a README and CONTRIBUTING.
• Tools to build the project and a Makefile to automate the process.
• Apache-2.0 license.
• CircleCI build CI manifest files.
• CODEOWNERS file to track owners of this project.