Let's see how the handle_continue callback is useful in GenServers.

Starting multiple pools, using the Registry to locate pool supervisors and stop them.

Preparing for multiple pools with the pools supervisor.

Remove static process names, provide the worker spec dynamically.

Make workers temporary and have the pool manager in charge of restarting them.

Handle worker deaths. (This is about OTP and not Human Resources...)

Use an ETS table to track client monitors.

Monitor client processes.

Implement worker checkin and checkout.

Make the worker supervisor start workers when it initializes.