Extend Kafka exporter to support profiling signal

[danielpacak]

Component(s)

exporter/kafka

Is your feature request related to a problem? Please describe.

There is this relatively new profiling signal supported by OTel described at https://opentelemetry.io/blog/2024/state-profiling/.

It would be nice to collect and store profile samples in Kafka topics, which is currently not supported by the Kafka exporter.

Describe the solution you'd like

Add support for profiling signal so w can configure it as follows:

receivers:
  otlp:
    protocols:
      grpc:
        endpoint: ${env:MY_POD_IP}:4317
      http:
        endpoint: ${env:MY_POD_IP}:4318
exporters:
  otlp/pyroscope:
    endpoint: http://pyroscope.pyroscope:4040
    tls:
      insecure: true
  kafka/profiles:
    encoding: json
    brokers:
      - kafka.kafka:9092
    topic: my_profiles
service:
  pipelines:
    profiles:
      receivers:
        - otlp
      exporters:
        - otlp/pyroscope
        - kafka/profiles

There are options to marshal the profiling samples, but to get this feature off the ground we can use a default, opinionated marshaller just to forward messages to Kafka.

Describe alternatives you've considered

No response

Additional context

No response

[github-actions]

Pinging code owners:

• exporter/kafka: @pavolloffay @MovieStoreGuy

See Adding Labels via Comments if you do not have permissions to add labels yourself.

[github-actions]

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Pinging code owners:

• exporter/kafkaexporter: @pavolloffay @MovieStoreGuy @axw

See Adding Labels via Comments if you do not have permissions to add labels yourself.