Hi, once upon a time Tor used to take care of this by itself, updating the descriptor, but at some version it stopped doing so. At least my Tor did stop. Or maybe it does it again, but I haven't checked... 
I've solved with a script that connects to some url that gives back my public IP*, and if it's changed calls
/etc/rc.d/rc.tor restart
My two cents, Marco
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Tor Relay Net Ops via tor-relays wrote on 9/25/24 12:53:
Greetings fellow relay operators!
I'm currently running a tor relay on a dynamic IP Address connection, usually my ISP gives me a new address every day or so-
*
https://secure.informaction.com/ipecho/
https://checkip.amazonaws.com/
...plenty more...
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