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## Problem Hard to tell 1. How many clients are connected to proxy 2. How many requests clients are making 3. How many connections are made to a database 1 and 2 are different because of the properties of HTTP. We have 2 already tracked through `proxy_accepted_connections_total` and `proxy_closed_connections_total`, but nothing for 1 and 3 ## Summary of changes Adds 2 new counter gauges. * `proxy_opened_client_connections_total`,`proxy_closed_client_connections_total` - how many client connections are open to proxy * `proxy_opened_db_connections_total`,`proxy_closed_db_connections_total` - how many active connections are made through to a database. For TCP and Websockets, we expect all 3 of these quantities to be roughly the same, barring users connecting but with invalid details. For HTTP: * client_connections/connections can differ because the client connections can be reused. * connections/db_connections can differ because of connection pooling.