Description

Hey guys, maybe a small bit of feedback on your docs. I struggled to figure out what port prometheus runs on for lighthouse.

At first, I couldn't find any reference to it in lighthouse-book.sigmaprime.io, and assumed to monitor lighthouse I would use the REST API.

Then I spotted it was mentioned in the readme as Metrics via Prometheus.. I also spotted it mentioned here: https://hub.docker.com/r/paulhauner/lighthouse and here #1197 So I knew it existed somewhere. I eventually figured out it runs on :5052/metrics by looking at the docker-compose file in this repo. https://github.com/sigp/lighthouse-docker/blob/master/docker-compose.yml#L11

Version

Docker sigp/lighthouse:latest with ID 7076af925f61

Present Behaviour

App works fine

Expected Behaviour

Maybe just a mention of the default metrics port here https://lighthouse-book.sigmaprime.io/docker.html would work. Other clients allow you to specify a metrics port via CLI flag, but I don't particularly need that feature.

Steps to resolve

Just a bit of documentation :)