Support defining Cortex Rules in Agent config

[rfratto]

Based on this discussion, I'd like it if the Agent could support recording and alerting rule definitions that are synced against the Cortex Ruler API.

[stale]

This issue has been automatically marked as stale because it has not had any activity in the past 30 days. It will be closed in 7 days if no further activity occurs. Thank you for your contributions.

[jpkrohling]

Here's a recap of what we discussed today regarding this task:

• A new config section is to be added, mimicking the option rule_files from the Prometheus configuration
• Upon bootstrap, the agent will read all the files and potentially parse them
• It will then compare with the list of rules from the remote Cortex server and synchronize it when needed
• When the reload operation is performed, we'll re-read the files and synchronize again with the remote Cortex server

Given what we discussed, I assume we don't have to care that much about files from Cortex that aren't in the local file system, only about local files that aren't on the remote server.

The cortextool can be used as a reference, especially the rules load command: https://github.com/grafana/cortex-tools#rules-loada

[jpkrohling]

I'm removing myself from this task, as it's been for a while in my queue and I can't seem to even get started with it. I'll try to get a smaller issue first to get myself more comfortable with this codebase and might work on this again in the future. Sorry about that :-/

[sambacha]

Any update on this issue? This is a blocker to adopting grafana