A :sregulator callback module using an unlimited queue and a CoDel strategy for the valve.

Connection options

• :idle_interval - The time interval in milliseconds before the pool will start increasing connections, ideally the 95-99 percentile the connection and handshake time for a database connection (default: 100)
• :idle_target - The target idle time for a connection in milliseconds, ideally 5-10% of the :idle_interval so the connection queue does not shrink or grow too quickly (default: div(idle_interval, 20))

Underload alarm options

• :underload_alarm - Either true to set an alarm on underload or false not to - underload means less connection processes are queuing with the regulator than expected and should only occur if connection processes are unable to connect to the database (default: true)
• :underload_target - The target time in milliseconds for the regulator to wait for a connection process (default: 500)
• :underload_interval - The interval in milliseconds for an alarm to be set when the regulator is waiting longer than the target time for a connection process (default: 5_000)