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Structured Logging

Logging is one of the pillars of observability alongside distributed tracing and metrics. Microbus uses Go's standard log/slog for logging with output directed to stderr.

Logs are printed in human-friendly format in the LOCAL and TESTING deployment environments and in JSON in PROD and LAB.

Logs are automatically enriched with the microservice's hostname, version number and ID, as well by the distributed trace ID, if applicable.

In addition, logs are metered on a per-message basis to make them visible in Grafana. For this reason, the message part should be a fixed string, and all variable parts added as arguments.

The Connector supports 4 methods for logging at different severity levels: LogDebug, LogInfo, LogWarn and LogError. Debug logs are ignored unless the MICROBUS_LOG_DEBUG environment variable is set.

Example:

c.LogInfo(ctx, "Fixed message",
    "key1", "value",
    "key2", 1234,
)