* Does it make sense to tie this to smart shutdowns? I realize it's just
an example, and it probably makes sense to send the GoAway message
before a shutdown. But isn't this a bit similar to cancel/terminate of a
backend? Why not to have a pg_goaway_backend() function, that'd send the
message to a single backend? It might be useful for load-balancing, if
we could pick a "heavy" backend and ask it to reconnect / move to a
different replica. (Could that be handled by a middleware?)
+1. Another scenario that comes to mind is asking for a reconnect based on backend memory consumption, since there's a bunch of internal structures (relcache, etc) that can grow in an unbounded fashion.