agent: Add scaling event reporting

sharnoff commented 1 month ago

This is part 2 of 2; see #1078 for the ground work and neondatabase/cloud#15939 for the full context.

In short, this PR:

Adds a new package: pkg/agent/scalingevents
Adds new callbacks to core.State to allow it to report on scaling events changes in desired CU.

Notes for review:

I'd like to add minio-based S3 tests to this, but it seemed like it'd be non-trivial, particularly because scaling events actually require that there's scaling that happens — unlike the existing billing tests.

So I figured I'd open this for review in the meantime.

~~Also note: This PR builds on #1078 and must not be merged before it.~~

github-actions[bot] commented 1 month ago

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sharnoff commented 1 week ago

Remaining items for me, on this:

Add more thorough e2e tests
Test on staging

In the meantime, it should be ok to review.

neondatabase / autoscaling

agent: Add scaling event reporting #1107