Update Zeo without Stop Clients

To update a .py or .pt on developed add-on in a zeo server I always run bin/plonectl stop and then run bin/plonectl start. For a couple minutes all sites are down. Is it possible to update a .pt or .py file without stop all clients?

I always have 2 or more zeo clients on a production instance which allows
me to restart one client at a time so there is at least one available at
all times.

If you run Plone in "development mode", then changes in ".pt" files become automatically effective. To make changes in ".py" files effective without restart, I am using plone.reload. In many cases, it avoids a restart - however, there are cases where a restart is still necessary.

Thank you for your idea. I'll try to do it. I believe it will solve my problem.