feat(azuremonitorexporter): add support for authenticator extensions

[gravufo]

Description

Add support for authenticator extensions in Azure Monitor exporter.

Link to tracking issue

Fixes #41004

Documentation

Updated Authentication.md with an example.

[atoulme]

Please resolve conflicts and take a look at early comments.

[hgaol]

Hi @gravufo , thanks for the contribution. Have you validated it using real application insights?

[gravufo]

@hgaol sorry for the delay. I finally managed to run it on a kubernetes cluster on our side and tested with a real application insights and we can see that it works as expected.
Here is the config I used:

    exporters:
      azuremonitor:
        connection_string: 'InstrumentationKey=<redacted>;IngestionEndpoint=https://<redacted>.in.applicationinsights.azure.com;LiveEndpoint=https://<redacted>.livediagnostics.monitor.azure.com/;ApplicationId=<redacted>'
        auth:
          authenticator: azureauth
        sending_queue:
          enabled: true
      debug:
        verbosity: basic
    extensions:
      azureauth:
        scopes:
        - https://monitor.azure.com/.default
        workload_identity:
          client_id: ${env:AZURE_CLIENT_ID}
          federated_token_file: ${env:AZURE_FEDERATED_TOKEN_FILE}
          tenant_id: ${env:AZURE_TENANT_ID}
      health_check:
        endpoint: ${env:MY_POD_IP}:13133
    receivers:
      otlp:
        protocols:
          grpc:
            endpoint: 0.0.0.0:4317
          http:
            endpoint: 0.0.0.0:4318
    service:
      extensions:
      - health_check
      - azureauth
      pipelines:
        logs:
          exporters:
          - azuremonitor
          - debug
          receivers:
          - otlp
        metrics:
          exporters:
          - debug
          receivers:
          - otlp
        traces:
          exporters:
          - azuremonitor
          - debug
          receivers:
          - otlp
      telemetry:
        metrics:
          readers:
          - pull:
              exporter:
                prometheus:
                  host: 0.0.0.0
                  port: 8888

[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 14 days.

[gravufo]

/fresh waiting on review comments.

[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 14 days.

[gravufo]

/fresh

[atoulme]

@hgaol please take another look? @gravufo please attend to the conflicts

[ChrsMark]

@gravufo please rebase

[edmocosta]

This discussion is still open, and we're waiting for the code-owner to decide what should be done next. Just a FYI for the next ready to merge reviewer.

[atoulme]

Converting to draft while conflicts are on, please fix and mark ready for review again.

[gravufo]

@edmocosta thanks for the suggestion. The discussion should now be closed, this can proceed to be merged.

[edmocosta]

Hi @gravufo @hgaol, could you please fix the collector dependency version on the go.mod that's failing the CI? Thanks!

[gravufo]

@edmocosta I'm not sure what I'm supposed to do here. I only added one dependency and it has the same version as other dependencies from the collector in the same go.mod file.
The CI is complaining about indirect references, but those are added by go mod tidy, not manually...

[edmocosta]

Hi @gravufo, could you please resolve the conflicts, update the branch with main, and make tidy the module? so we can double check if the error persists after the latest collector dependencies update? Thanks.

[gravufo]

@edmocosta done but still the same error

[otelbot]

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