Unregistration is a hack and we shoould either make the subsystems into
an entry (if monitor allows subentry generation) or implement subsystem
unregistration in back-monitor.

Ondřej Kuzník authored May 10, 2017 and Ondřej Kuzník committed Nov 17, 2020

Several threads calling backend_select might reset current_backend to a
different place, there are two options to deal with that:
- just let the last rotation win (the current approach)
- detect whether first == current_backend and only replace then

Not sure which one is more useful, going with the simpler.

Ondřej Kuzník authored May 10, 2017 and Ondřej Kuzník committed Nov 17, 2020

This alone doesn't make the server do a round robin.