netstat to collect tcp connections per port

Feature Request

Proposal:

I'd like to see implemented the netstat plugin to collect the connection states per port that the system/a service listens on, just like the TCPConns plugin of collectd

Current behavior:

The netstat plugin only gathers the amount of state types.

Desired behavior:

The netstat plugin gathers amount of state types per port.

Use case:

Currently we're using the collectd plugin to show us how much connections each of our dovecot backend nodes is handling. We'd like to replace this with Telegraf.