Rules and Alerts sidecar to post config to API instead

[paul-bormans]

Is your feature request related to a problem? Please describe.
When rules and alerts are already made available in ConfigMaps (for instance through prometheus-operator) then Cortex has the option to use a sidecar (kiwigrid) to mount these configs into the ruler and alertmanager pods. But this requires to use the filesystem storage backend which amongst others blocks ruler sharding.

Describe the solution you'd like
We extended the sidecar project (here: https://github.com/Paul424/cortex-k8s-sidecar) to POST the config instead on the Cortex API. Our question is if we could propose a PR to integrate it into the Cortex helm charts? and how?

Describe alternatives you've considered
Cortex should maybe have it's own operator that covers pulling in rules and alert configuraton.

[stale]

This issue has been automatically marked as stale because it has not had any activity in the past 60 days. It will be closed in 15 days if no further activity occurs. Thank you for your contributions.