Generate prometheus metrics for flask and add metrics endpoint #399
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Description
Adds a /metrics route for prometheus to pull lots of data about what flask is doing, and also a few testflinger things like job submissions. This can be extended if we want to add more things.
Resolved issues
N/A
Documentation
N/A (the more interesting bits will come when we hook it up to grafana)
Web service API changes
Technically, yes it adds
/metrics
but it's only meant to be consumed by prometheus and is a well-known interface for anything that uses prometheus metrics. It's not a Testflinger APITests
I've hooked this up to a local prometheus/grafana instance and was able to get data from it