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Add distributed tracing using OpenTelemetry with OTLP gRPC exporter. HTTP handler wrapped with otelhttp for automatic span creation. 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-stdoutotelhttp.NewHandlerfor automatic span creationsigstore/model-validation-operator/pkg/tracingChanges
cmd/timestamp-server/app/root.go: Add 4 tracing CLI flagscmd/timestamp-server/app/serve.go: Initialize tracing provider on startuppkg/generated/restapi/configure_timestamp_server.go: Wrap HTTP handler withotelhttp.NewHandlergo.mod/go.sum: Add tracing dependenciesTest plan
--tracing-enabled --tracing-endpoint <collector>and verify traces in Jaeger--tracing-stdoutoutputs traces to stdout