Add state for alarm_control_panel in Prometheus

[DeathCamel58]

Proposed change

Export alarm_control_panel state with Prometheus.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

This adds support for exporting alarm_control_panel state with Prometheus.

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist
• I have followed the perfect PR recommendations
• The code has been formatted using Ruff (ruff format homeassistant tests)
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

If the code communicates with devices, web services, or third-party tools:

• The manifest file has all fields filled out correctly.
  Updated and included derived files by running: python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt.
  Updated by running python3 -m script.gen_requirements_all.
• For the updated dependencies - a link to the changelog, or at minimum a diff between library versions is added to the PR description.

To help with the load of incoming pull requests:

• I have reviewed two other open pull requests in this repository.

[home-assistant]

Hi @DeathCamel58

It seems you haven't yet signed a CLA. Please do so here.

Once you do that we will be able to review and accept this pull request.

Thanks!

[home-assistant]

Please take a look at the requested changes, and use the Ready for review button when you are done, thanks 👍

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[home-assistant]

Hey there @knyar, mind taking a look at this pull request as it has been labeled with an integration (prometheus) you are listed as a code owner for? Thanks!

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Stale

[knyar]

Thank you for submitting a PR! Looks good overall, just a couple of small comments from me.

Also, do you think you would also be able to add a simple test? You can look at the recent test changes to find a good example, like #119805.

[DeathCamel58]

I've added the requested unit tests.

[knyar]

Thank you! Just one minor comment, otherwise lgtm.
Appreciate adding the test!

[knyar]

Thank you! Hopefully one of Home Assistant maintainers will be able to merge this soon.

[knyar]

👍

[MartinHjelmare]

Thanks!

[MartinHjelmare]

For the future, please don't amend or squash commits after review has started to make it easier for readers to track changes. Thanks!

[MartinHjelmare]

We missed to update the docs. Please update this list:

https://www.home-assistant.io/integrations/prometheus/#supported-metrics