Prometheus service metrics

[vholer]

It could be interesting if sshpiper exposes the metrics on a dedicated port in common Prometheus/OpenMetrics format, so that the use of service can be monitored.

Examples of metrics:

basic:

• uptime
• pipes count
• active sessions count (full successful connection from down to up)

intermediate:

• downstream and upstream connections
  • counter of total/failed/successful
  • gauge of currently opened connections
  • breakdown on pipes?
  • breakdown on key types?

advanced:

• traffic counter (separated down/upstream)

...

[tg123]

i have an internal version with metric but not fancy enough
but there is a kill pipe cmd

will clean up and open them and make the metrics expose to Prometheus