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Add distributed tracing using OpenTelemetry with OTLP gRPC exporter. Tracing can be enabled via --tracing.enabled flag with configurable endpoint, insecure mode, and stdout export for debugging. 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.stdoutotelhttpfor automatic span creationsigstore/model-validation-operator/pkg/tracingChanges
cmd/rekor-server/app/root.go: Add 4 tracing CLI flagscmd/rekor-server/app/serve.go: Initialize tracing provider on startuppkg/generated/restapi/configure_rekor_server.go: Wrap HTTP handler withotelhttp.NewHandlergo.mod/go.sum: Add tracing dependenciesTest plan
--tracing.enabled --tracing.endpoint <collector>and verify traces appear in Jaeger--tracing.stdoutoutputs traces to stdout