Merge branch 'v3.9.x' into mergify/bp/v3.9.x/pr-3560

Author: michaelklishin

deps/rabbit/src/rabbit_vm.erl

@@ -231,7 +231,7 @@ conn_sups()     ->
 
 ranch_server_sups() ->
     try
-        ets:match(ranch_server, {{conns_sup, '_'}, '$1'})
+        [Pid || {_, _, Pid} <- ranch_server:get_connections_sups()]
     catch
         %% Ranch ETS table doesn't exist yet
         error:badarg  -> []

release-notes/3.9.8.md

@@ -23,7 +23,12 @@ Contributors are encouraged to update them together with their changes. This hel
 * When the mandatory flag was used when publishing to classic queues,
   but publisher confirms were not, channels memory usage would grow indefinitely.
 
-   GitHub issue: [#3560](https://github.com/rabbitmq/rabbitmq-server/issues/3560)
+  GitHub issue: [#3560](https://github.com/rabbitmq/rabbitmq-server/issues/3560)
+
+* `rabbitmq-diagnostics memory_breakdown` failed to read memory of connection
+  reader, writer and channel processes.
+
+  GitHub issue: [#3570](https://github.com/rabbitmq/rabbitmq-server/issues/3570)
 
 
 ## Dependency Upgrades