Profile samples are being counted as traces in the ingestion flow

[Zirak]

Component(s)

receiver/otlp

What happened?

Describe the bug
The profiles OTLP receiver calls StartTracesOp / EndTracesOp instead of StartProfilesOp / EndProfilesOp, causing all received profile samples to be reported as trace spans in observability metrics.

What did you expect to see?
Profile samples reported under profiles receiver metrics.

What did you see instead?
More traces than we expected to see, without any profiles-specific metrics emitted.

Collector version

d686cf9

Environment information

No response

OpenTelemetry Collector configuration

receivers:
    otlp:
      protocols:
        http:
          endpoint: 0.0.0.0:4318
        grpc:
          endpoint: 0.0.0.0:4317
  
  processors:
    batch:
      timeout: 10s
  
  exporters:
    debug:
      verbosity: detailed
  
    prometheus:
      endpoint: 0.0.0.0:9999
  
  service:
    pipelines:
      metrics:
        receivers: [otlp]
        processors: [batch]
        exporters: [prometheus]
      traces:
        receivers: [otlp]
        processors: [batch]
        exporters: [debug]
      logs:
        receivers: [otlp]
        processors: [batch]
        exporters: [debug]
      profiles:
        receivers: [otlp]
        exporters: [debug]

Log output

Additional context

No response

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[axw]

Thanks for the report and PR!