Support Thanos metrics provider in Keptn Metrics Operator

[odubajDT]

Goal

Support Thanos metrics provider as Keptn Metrics Provider.

Details

Thanos implements the Prometheus HTTP API to query data via PromQL. Therefore it is possible to use the current implementation of Prometheus provider and introduce an integration with Thanos.

DoD

• use the already implemented Prometheus provider and adapt the provider.go to support Thanos
• unit tests
• integration tests
• document new provider usage

[sudiptob2]

I am interested in this ticket

[odubajDT]

Thanks for interest! We need to refine it first, but afterwards it can be assigned to you directly :)

[rakshitgondwal]

We already have a draft PR open to integrate thaons as a provider #1267

[shayyxi]

I am continuing the work on the PR which would implement this.

[mowies]

docs on how to create a new metrics provider: https://keptn.sh/latest/docs/contribute/software/add-new-metric-provider/

[odubajDT]

Hi @shayyxi due to time pressure for the upcoming stable release, we decided to unassign the issue from you to make it available for other contributors. Please feel free to grab another issue and thank you for your effort!