Expose prometheus-compatible validator metrics

[MakarovSg]

The prometheus metrics is pretty much an industry standard. It would be really helpful to have a separate port of a local validator exposing crucial metrics like chain head, current headlag, peer information, network metrics. These metrics can help teams to configure a robust monitoring and alerting infrastructure ensuring high QoS for their customers. Current workflow with logging into the node and running status command is completely unmanageable on the larger scale.

[jer117]

I agree, it should be exposed. I was searching for the port.

[tvorogme]

@MakarovSg maybe https://github.com/troman29/ton-exporter can help