SigNoz is an open-source APM. It helps developers monitor their applications & troubleshoot problems, an open-source alternative to DataDog, NewRelic, etc.

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Though:   The sample on the Go page isn’t happy.

  <http://go.opentelemetry.io/otel/exporters/otlp|go.opentelemetry.io/otel/exporters/otlp> imports
        <http://go.opentelemetry.io/otel/sdk/metric/controller/basic|go.opentelemetry.io/otel/sdk/metric/controller/basic> imports
        <http://go.opentelemetry.io/otel/metric/registry|go.opentelemetry.io/otel/metric/registry>: module <http://go.opentelemetry.io/otel/metric@latest|go.opentelemetry.io/otel/metric@latest> found (v0.24.0), but does not contain package <http://go.opentelemetry.io/otel/metric/registry|go.opentelemetry.io/otel/metric/registry>