I have a couple Smartthings multisensors that lost connection with the hub. Do I remember that there is a way to rediscover these without reseting them?
Yes, just put them into pairing mode again (if you have the latest/2018 mutlisensor, this means resetting the device by holding the pairing button in for about 5 seconds--you'll need a papercip, SIM card ejector, or other small tool) and put Hubitat in Zigbee discovery mode. The key is not to remove them from Hubitat first. Upon re-pairing, it will recognize the device as the "old" one, and you'll be good to go!
This trick only works for Zigbee; with Z-Wave, we aren't so lucky.
That did it, Thanks.