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Add distributed tracing using OpenTelemetry with OTLP gRPC exporter. gRPC server instrumented with otelgrpc to receive trace context from upstream services (e.g., Rekor). Tracing is controlled via CLI flags. Uses the shared tracing library from sigstore/model-validation-operator. Signed-off-by: Nina Bongartz <nolear@redhat.com>
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Summary
--tracing-enabled,--tracing-endpoint,--tracing-insecure,--tracing-stdoutotelgrpc.NewServerHandler()to receive trace context from Rekorsigstore/model-validation-operator/pkg/tracingChanges
cmd/trillian_log_server/main.go: Add tracing flags, initialization, and gRPC server handlergo.mod/go.sum: Add tracing dependenciesTest plan
--tracing-enabled --tracing-endpoint <collector>alongside Rekor