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Currently, Prometheus fails to fetch metrics from headless because its metrics export result isn't compatible for the standard or Prometheus' way. So I had disabled it in #2460 temporarily. And it is enabled again in this version and the error occurs again. But, fortunately, it seems fixed in OpenTelemetry 1.9.0 by open-telemetry/opentelemetry-dotnet#5646. So this pull request bumps them to 1.9.0