DBConnection Error - connection not available and request was dropped

[sorentwo]

@maltoe

• My main idea for a culprit: For scheduled (cron) jobs, we have Oban running. These jobs are also likely to checkout a DB connection.
• Otherwise the application should be more or less asleep, at least judging from our code. We also have plenty of DB connections available, so in theory the pool should not run out of them.

The cron scheduler checks out a connection once a minute. Each running queue will checkout a database connection once per second (unless you’ve configured a different poll invertal). The number of attempted connections will scale linearly with the number of queues, so that increases the potential to have db connection issues.