[receiver/azureeventhub] Implements support to ingest app metrics

[olofmontin-truesec]

Description

• Extends the metrics unmarshaler with support for parsing metrics with type "AppMetrics" forwarded from Application Insights
• Moves the appending of attributes into each record, as if there could be records from multiple resources within the same payload
• Implements an optional average aggregator, configured in the component config

Link to tracking issue

Fixes #41343

Testing

Tests added for the parsing of both resource and app metrics.

Maybe not of value for you, but tested in my development environment in Azure, receiving metrics from remote tenants and exporting to a managed prometheus data collection rule using the Prometheus remote writer exporter.

Documentation

I'm happy to extend the documentation if this code and feature is of any interest

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: atoulme / name: Antoine Toulme (71cc7d5)
• ✅ login: olofmontin-truesec / name: Olof Montin (242eac7)

[cparkins]

@olofmontin-truesec Is there some documentation about how these AppMetrics are structured? In my original work it wasn't something that I was consuming. I think it would be good to expand the README to include information related to how these type of values are handled versus typical Resource Metrics.

[olofmontin-truesec]

@olofmontin-truesec Is there some documentation about how these AppMetrics are structured? In my original work it wasn't something that I was consuming. I think it would be good to expand the README to include information related to how these type of values are handled versus typical Resource Metrics.

@cparkins, good question! I peeked into the event hubs messages and used that data. It follows the documentation partly, as the data contains some of the fields specified.

The documentation I found was

• https://learn.microsoft.com/en-us/azure/azure-monitor/platform/stream-monitoring-data-event-hubs
• https://learn.microsoft.com/en-us/azure/azure-monitor/app/data-model-complete#custom-metrics
• https://learn.microsoft.com/en-us/azure/azure-monitor/reference/tables/appmetrics

When thinking about it, I didn't check if there was a go implemented SDK with the model. Did some brief searching and couldn't find any.

Yes, I'm happy to extend the README

[olofmontin-truesec]

I'll be off on vacation next week, and thereby no activity here until the 28th of August.

[github-actions]

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

[cparkins]

@atoulme How can we get the workflows approved?

[atoulme]

I have to explicitly approve each run.

[olofmontin-truesec]

I have to explicitly approve each run.

That's a lot of workloads to approve 😅
Thanks a lot @atoulme 🙏🏻

[olofmontin-truesec]

I see there's some issues with missing changelog and license. I'll fix those. And I can also add some test data.

[github-actions]

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

[github-actions]

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Important reminders:

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[atoulme]

@olofmontin-truesec please address the CI and mark ready for review again

[github-actions]

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

[atoulme]

Running CI again.

[github-actions]

Welcome, contributor! Thank you for your contribution to opentelemetry-collector-contrib.

Important reminders:

• Please review our Contributing Guidelines.
• Don't forget to sign the Contributor License Agreement (CLA) if you haven't already.

A maintainer will review your pull request soon. Thank you for helping make OpenTelemetry better!