Since it's an important part of a connection pool configuration, allow
to configure max db connections, that pool will open to a target db.
From this numbers several others (like default pool size, min pool size,
reserve) will be deduced, taking into account desired number of instances.
Add synchronization logic. For now get rid of podTemplate, type fields.
Add crd validation & configuration part, put retry on top of lookup
function installation.
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