webserver https://github.com/ninenines/cowboy
example monitoring stack https://github.com/ToddG/erlang-seed
prometheus https://prometheus.io/docs/instrumenting/exposition_formats/#format-version-0-0-4 https://github.com/deadtrickster/prometheus.erl https://github.com/deadtrickster/prometheus-cowboy/blob/master/doc/prometheus_cowboy2_instrumenter.md Comes with a nice set of built-in labels adds default configuration for you