[Feature] support prometheus-operator serviceMonitor and prometeusRules

[PedroMSantosD]

Description

This enables exposing elastalert2 using the 'metrics' configuration section of the Chart. It also supports creating both serviceMonitor and prometheusRules custom resources for prometheus-operator to be able to automacitally detect and reconfigure prometheus accordingly.

Breaking change:

• The labelset of kubernetes objects have been changed to match helm_charts recommended labels. You'll need to uninstall and reinstall the chart for it to work.
• Enabling of the metrics endpoint, configuration of pod port and annotations have been moved to metrics section.

Checklist

• I have reviewed the contributing guidelines.
• [] I have included unit tests for my changes or additions.
• I have successfully run make test-docker with my changes.
• I have manually tested all relevant modes of the change in this PR.
• [] I have updated the documentation.
• I have updated the changelog.

Questions or Comments

no manual tests included for the chart. It has been deployed through helm_install without issues.

[jertel]

Thanks for submitting this. Please take a look at the README.md descriptions -- I spotted several typos on the new field descriptions. I'll leave it open for a few days to let others comment, since, as you said, it will impact existing chart users.

[PedroMSantosD]

Hi, file updated. I have a question thought,
most of the files have been adapted from repo: https://github.com/bitnami/charts/tree/master/bitnami/thanos/templates
Does this have to be mentioned anywhere ?

[jertel]

Hi, file updated. I have a question thought, most of the files have been adapted from repo: https://github.com/bitnami/charts/tree/master/bitnami/thanos/templates Does this have to be mentioned anywhere ?

It's fine with me if you'd like to mention in the chart's README.md where you found the inspiration for the new tagging structure.

There are still some typos on the README field descriptions (like merics instead of metrics, aply instead of apply and when detected when detected). If you don't get around to fixing them I'll make some edits later this week as time allows.

[jertel]

Please correct the checklist in this PR. There are slashes instead of x's and it makes it difficult to understand which checklist items you are marking as completed. Use an x to mark a check list item as complete. If it does not apply, such as unit test updates, leave it blank.

[albertoCrego]

@jertel when will be available the new release? This feature's really useful.

[jertel]

The current plan is this weekend.