Action-metric-server configuration

[ozlotusflare]

Hey dear community!
I'm trying to setup and use actions-metrics-server , but faced with leak of documentation.
I have run actions-metrics-server with ingress.

# web output
actions-metrics-server is running

than I configured GH webhook and I see that events are working

But, I don't see any metrics.
Could you please suggest, what I missed or misconfigured, and It'll be useful to add some extended documentation about configuration.
Thanks!