Prometheus metrics

[freak12techno]

I'm using Prometheus a lot of metrics and alerting and it'd be nice if tmkms would expose some of its own metrics in a Prometheus compatible format so I'd have an overview on how good tmkms is performing and can add another alerts set for it. At least the following would be nice to have:

• last signed h/r/s
• whether tmkms was able to connect successfully to a fullnode or not, or errors count
• doublesign attempts

Do you think it's possible or desireable?

[tony-iqlusion]

See #667

[freak12techno]

That would solve it for me. Any estimation on when this can be merged?

[tony-iqlusion]

Whenever I have time to review it.

In the meantime you can run that branch and report back on how well it's working, which would be helpful with the review process.

[zheli]

+1

[tony-iqlusion]

My feedback on #667 (which is now stale) was that I would prefer to use https://autometrics.dev/ instead