feat(otel): Add OpenTelemetry distributed tracing and ctutils logging integration #3
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… integration
This change integrates the digicert/ctutils shared logging library to enable
OpenTelemetry-compliant distributed tracing across the Trillian log server and
signer components.
Key changes:
- Add config/config.go with InitLogging() for centralized OTEL configuration
- Update log_server and log_signer main.go to call config.InitLogging()
- Add chained gRPC interceptors for trace context propagation
- Add Dockerfile.unified with SSH access for private ctutils dependency
- Update go.mod/go.sum for ctutils v0.1.6 and OTEL dependencies
The logging configuration is driven by environment variables:
- OTEL_ENABLED: Enable/disable OpenTelemetry (default: false)
- OTEL_EXPORTER: Exporter type ('otlp' or 'stdout')
- OTEL_COLLECTOR_ENDPOINT: OTLP collector URL
- OTEL_SERVICE_NAME: Service name for traces
- OTEL_SAMPLE_RATIO: Sampling ratio (0.0-1.0)
This enables end-to-end request tracing from CTFE through Trillian backends,
allowing operators to correlate logs and traces across the CT infrastructure.
Refs: RA-8279
chore(deps): update ctutils
chore(deps): update ctutils
chore(deps): update ctutils
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Summary
This PR integrates the digicert/ctutils shared logging library to enable OpenTelemetry-compliant distributed tracing across the Trillian log server and signer components.
Changes
InitLogging()Configuration
Tracing is controlled via environment variables:
OTEL_ENABLEDfalseOTEL_EXPORTERotlporstdout)stdoutOTEL_COLLECTOR_ENDPOINTlocalhost:4317OTEL_SERVICE_NAMEOTEL_SAMPLE_RATIO1.0Related PRs
Testing
Manual testing with local OTEL collector. Full integration testing planned.
Refs: RA-8279