Changelog

CHANGELOG.md

@@ -11,6 +11,21 @@
   config.trace_propagation_targets = [/.*/]  # default is to all targets
   config.trace_propagation_targets = [/example.com/, 'foobar.org/api/v2']
   ```
+- Tracing without Performance
+  - Implement `PropagationContext` on `Scope` and add `Sentry.get_trace_propagation_headers` API [#2084](https://github.com/getsentry/sentry-ruby/pull/2084)
+
+  The SDK now supports connecting arbitrary events (Errors / Transactions / Replays) across distributed services and not just Transactions.  
+  To continue an incoming trace starting with this version of the SDK, use `Sentry.continue_trace` as follows.
+
+  ```rb
+  # rack application
+  def call(env)
+    transaction = Sentry.continue_trace(env, name: 'transaction', op: 'op')
+    Sentry.start_transaction(transaction: transaction)
+  end
+  ```
+
+  To inject headers into outgoing requests, use `Sentry.get_trace_propagation_headers` to get a hash of headers to add to your request.
 
 ### Bug Fixes
 

sentry-ruby/lib/sentry/hub.rb

@@ -246,10 +246,15 @@ def get_baggage
     def get_trace_propagation_headers
       return nil unless configuration.propagate_traces
 
-      {
-        SENTRY_TRACE_HEADER_NAME => get_traceparent,
-        BAGGAGE_HEADER_NAME => get_baggage
-      }.compact
+      headers = {}
+
+      traceparent = get_traceparent
+      headers[SENTRY_TRACE_HEADER_NAME] = traceparent if traceparent
+
+      baggage = get_baggage
+      headers[BAGGAGE_HEADER_NAME] = baggage if baggage && !baggage.empty?
+
+      headers
     end
 
     private

sentry-ruby/lib/sentry/net/http.rb

@@ -31,7 +31,10 @@ def request(req, body = nil, &block)
 
         Sentry.with_child_span(op: OP_NAME, start_timestamp: Sentry.utc_now.to_f) do |sentry_span|
           request_info = extract_request_info(req)
-          set_propagation_headers(req, request_info)
+
+          if propagate_trace?(request_info[:url], Sentry.configuration.trace_propagation_targets)
+            set_propagation_headers(req)
+          end
 
           super.tap do |res|
             record_sentry_breadcrumb(request_info, res)
@@ -49,10 +52,7 @@ def request(req, body = nil, &block)
 
       private
 
-      def set_propagation_headers(req, request_info)
-        client = Sentry.get_current_client
-        return unless propagate_trace?(request_info[:url], client.configuration.trace_propagation_targets)
-
+      def set_propagation_headers(req)
         Sentry.get_trace_propagation_headers&.each { |k, v| req[k] = v }
       end