feat(server): unified metrics endpoint

[daniellacosse]

location and stuff look like that because i didn't run it on docker yet (no IP tables)

[daniellacosse]

For some reason the metrics from prometheus are now coming back empty - in the process of debugging

[daniellacosse]

For some reason the metrics from prometheus are now coming back empty - in the process of debugging

Ah okay, I just didn't understand how prometheus works. increase() requires two separate data points to return a value (the difference between the two points). I was calling increase() when there was only one data point, resulting in zero.

[fortuna]

Looks good. Just one minor thing. Also, please make sure this is still working by running a server and checking the API.

[daniellacosse]

[sbruens]

Tags is a list, so I think this should have been

tags:
  - Server

See the issue at https://redocly.github.io/redoc/?url=https://raw.githubusercontent.com/Jigsaw-Code/outline-server/master/src/shadowbox/server/api.yml