Circus socket file descriptor sharing enables zero-downtime reload

BentoML workers receive file descriptors from Circus via CircusSocket, enabling socket sharing across workers. This mechanism supports zero-downtime reloads by allowing new workers to accept connections on the same socket before old workers terminate.

When performing rolling updates, monitor worker process transitions. Verify new workers successfully bind to the CircusSocket before terminating old workers. Check Circus logs for socket handoff failures.