[tor-relays] "Graceful" Restart of Tor-Relay ?

[mistral.relay at posteo.net]

Hello all, a newbie question:

assuming that I want to shut down and restart a running tor-relay (for 
whatever reason; e.g. a linux reboot is required) - is it fine to just 
shut down the relay or is there a nicer, more tor-user friendly way so 
circuits don't drop for them unexpectedly?

I was thinking about a command to tell tor to complete whatever is 
ongoing, but to not accept any new circuits or other requests and then 
stop working. Would setting the BandwidthBurst to 0 followed by a 
tor-reload do this over some time (checking with e.g. arm what is still 
ongoing)?

Many thanks!