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The connection pool emits errors for each connection that fails on #initialize.
Given the nature of pools, it may be incorrect to consider that an error.
Review current log levels and adjust accordingly.
Any periodic tasks should emit logs at trace level.
Perhaps a logging engine message diagnostic context can help inform loggers about the calling context, e.g. background or foreground thread.
It would be helpful to log pool growth and shrinkage events at a more prominent log level, e.g. INFO or WARN, to facilitate performance tuning.
Increase pool log levels.
Log connection create and remove at info.