There are a number of things that we can do to improve our servers. For multithreaded systems, it's common to have a mechanism for capping the number of threads in use at any one time. This can be done by keeping a count of the active threads and immediately closing any new incoming connections from clients while it's above a threshold.

For all our servers, we would also want to add a logging mechanism. I strongly recommend the standard library logging module for this, the documentation for this is complete and full of good examples. The basic tutorial is a good place to start if you've not used it before, and it can be found at https://docs.python.org/3/howto/logging.html#logging-basic-tutorial.

We also want to handle errors more comprehensively. Since the intention is that our server should be long running with minimal intervention, we want to make sure that nothing less than a critical exception causes the process to exit. We also want to make sure that errors...