Hi, is it possible to have the connection pool pooling connections by host 
instead of db? i.e. it will change db upon reuse.

I'm asking because I have a lot of shards (databases) on every MySQL host 
and if I create a connection pool size of N, and the host contains M 
shards, it will create N*M connections to MySQL. Now that I use ProxySQL to 
do connection pooling, the actual number of connections to MySQL is 
lowered, but the number of connections to ProxySQL is still N*M, causing 
high CPU on ProxySQL due to system call poll and sleep.

Thanks!

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