List alarms in rabbitmqctl status
Optimise queue index initialisation

Avoid loading the journal when the file doesn’t exist.
Also try to avoid flushing the journal unless necessary.
merge default into bug25853
Fix a syntax error in config example
merge default into bug25853
merge default into bug25853
containing the recently merged bug25827
Introduce a new parallel (multi-server) call API
Refactor: tag replies safely and avoid using erlang:demonitor/2

For efficiency reasons, instead of demonitoring (which leads to scanning the
entire mailbox), cope with duplicate monitor refs when collating gen_server
replies.

For safety, tag the exit signal (which we treat as a result) with a unique
reference instead of the middle-man's pid.
Handle varying destinations in mcall/1
Add a note to the gs2 essay
Use gs2:mcall/1 in r_amqqueue:force_event_refresh/1
Fix multi-call tests
Remove rabbit_misc:multi_call/2
Cosmetic (ish)
Return the correct exit reason for unknown global registered names
move mcall docs to correct place, and improve them
refactor: lift do_mcall casing to head
refactor: simplify
Unify the test cases and cover all bases
First pass at cluster name.