Hello, I need some metrics to monitor connection pool state in production.
In ConnectionPool class there are inUseConnectionCount, futuresWaitingForConnectionCount and idleConnectionsCount. The problem is that they are constant variables, not functions, making them virtually useless to observe connection pool state as they are initialized once when making an instance of ConnectionPool.

https://github.com/jasync-sql/jasync-sql/blob/master/db-async-common/src/main/java/com/github/jasync/sql/db/pool/ConnectionPool.kt#L117