Proposal: Track rate limiting from GitHub API about derek

[rgee0]

A couple of initial notes while thinking.

GET /rate_limit exposes the values.

The limit appears to be distinct time-slices rather than a sliding window.

[alexellis]

Hmm is that a proposed API or a GH thing?

[alexellis]

Ok this.. https://developer.github.com/v3/rate_limit/

[alexellis]

We could definitely track it in alertmanager and send through to a webhook.

[alexellis]

Derek add label: priority/high

[alexellis]

I wonder if we should write a small function as a prometheus exporter which can produce this information for all the installations we have registered. It may involve us collecting the installation messages when the GitHub app is registered.

[Waterdrips]

https://developer.github.com/v3/#rate-limiting
The returned HTTP headers of any API request show your current rate limit status:

The remaining limit is in the X-RateLimit-Remaining header.

We could fire off some event when this gets low