I tried this on a "tunnel proxy hub" - one that's both a tunnel client and tunnel server plus running both get and attach queues. Compared to 7.70, 7.80 seems to be a lot more unstable with respect to maintaining queues.
If watched in the hub gui on the queue status tab, under 7.70, all the queues on this sample hub would stay green and connected as long as there was a corresponding active tunnel. And there would only ever be two colors: red or green.
With 7.80, I am frequently seeing the messages:
Jun 1 08:46:59:472 [140533975963392] hub: Subscribe to All_to_Proxy@/MergeHC-dom/***001001/hostname.***001001/hub failed (2 - communication error)
Jun 1 08:46:59:473 [140533975963392] hub: do_check_getq - failed to establish get route All_from_***001001 from /MergeHC-dom/***001001/hostname.***001001/hub, time used: 30024 ms
Jun 1 08:46:59:473 [140533063345920] hub: TSESS-A-1224-1 [***01001] sent 100 '_close' (315 bytes, 0 ms)
The "time used" value of 30024ms is suspicious - that looks like a timeout was reached.
And the queues are mostly red even though the tunnels between the hubs are up and stable.
The queues also seem to sit disconnected much longer - on the order of 10 minutes or so before they connect up again. You can see them cycling though if you sort by "established" column but when red and disconnected they cycle round and round. In 7.70, if a queue disconnected for some reason, usually 30 seconds later when it was rechecked, you'd see is go green again. Doesn't seem to be so in 7.80.
-Garin