Document how to remove monitoring of a rabbitmq queue

Signed-off-by: Pierre-Yves Chibon <pingou@pingoured.fr>

remove_monitoring_rabbitmq_queue.md

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+# How to remove the monitoring of a rabbitmq queue
+
+The monitoring of queue sizes of rabbitmq queue is done by nagios using two
+small configuration file.
+
+To remove that monitoring, you simply need to remove these two files.
+
+On the rabbitmq server (rabbitmq01):
+------------------------------------
+
+* Remove the local nagios configuration file
+
+    rm /etc/nrpe.d/check_rabbitmq_queue_<queue_name>.cfg
+
+* Then restart the local nagios plugin
+
+    systemctl restart nrpe
+
+On the nagios server (noc01):
+-----------------------------
+
+* Remove the nagios configuration file
+
+    rm /etc/nagios/services/rabbitmq-queue-<queue_name>.cfg
+
+* Ensure the configuration is still valid:
+
+    nagios -v /etc/nagios/nagios.cfg
+
+
+* If and only **if** the check above passed, restart nagios on the nagios server
+
+    systemctl restart nagios