[Bug 2073932] Re: rabbitmq_global_publishers and rabbitmq_global_consumers fail to handle unclean client termination

[Mauricio Faria de Oliveira]

Marking the devel series (Oracular) as Fix Released, as 3.12 has the fix
(verified).

Please also update that in future bugs :)

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https://bugs.launchpad.net/bugs/2073932

Title:
  rabbitmq_global_publishers and rabbitmq_global_consumers fail to
  handle unclean client termination

Status in rabbitmq-server package in Ubuntu:
  Fix Released
Status in rabbitmq-server source package in Jammy:
  Incomplete

Bug description:
  [Impact]

  When a client terminates uncleanly, the global counters for publishers
  and consumers do not handle this gracefully.

  For the consumer metric, the value of the gauge does not decrease after the termination, and so the value ever-increases.
  For the publisher metric, the value of the gauge decreases below zero and does not recover, leading to a ever-decreasing negative value on the gauge.

  [Test plan]

  lxc launch ubuntu:jammy rabbitmq-jammy-test

  lxc shell rabbitmq-jammy-test

  apt install -y rabbitmq-server

  echo '[rabbitmq_prometheus].' > /etc/rabbitmq/enabled_plugins

  systemctl restart rabbitmq-server.service

  wget https://github.com/rabbitmq/rabbitmq-perf-
  test/releases/download/v2.21.0/perf-test-2.21.0.jar

  apt install -y default-jre

  for i in $(seq 1 5); do java -jar perf-test-2.21.0.jar --time 5; curl
  -s 127.0.0.1:15692/metrics | grep -E
  'rabbitmq_global_(consumers|publishers){'; done

  The output of this command shows the value of the
  rabbitmq_global_consumers and rabbitmq_global_publishers after each
  execution of the test. The problem described of monotonically
  increasing and decreasing values will be observed. As we are
  connecting and disconnecting a single client the expected value should
  be 0 for both counters.

  [Where problems could occur]

  This is a simple patch that calls the functions for deleting consumers
  and publishers in the correct places. It should not break anything
  else than the counters themselves but they were broken to begin with.

  [Other Info]

  This was patched upstream from version 3.10 so this patch is already
  applied to Noble and Oracular that use version 3.12. This is the
  upstream patch: https://github.com/rabbitmq/rabbitmq-server/pull/6244

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