Add a collector to track TCP connections in the host_metrics source

[aryan9600]

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Use Cases

The host_metrics source can be enhanced by adding support for tracking TCP connections to it. This would let users get a sense of how many connections are in the system and in which state, along with the total tx/rx bytes. A good reference to use for the capabilities of the collector would be the tcpstat collector in node_exporter.

Attempted Solutions

No response

Proposal

We should modify the host_metrics source to export three metrics:

• tcp_connections of type gauge tracking the total number of TCP connections. It'll have a label state corresponding to the connection's state.
• tcp_tx_queued_bytes of type gauge tracking the cumulative sum of the Send-Q across all connections.
• tcp_rx_queued_bytes of type gauge tracking the cumulative sum of the Recv-Q across all connections.

I'm happy to work on a PR for this.

References

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Version

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