Add some quietus to the notifs-backend playbook.

playbooks/groups/notifs-backend.yml

@@ -57,6 +57,12 @@
   user: root
   gather_facts: True
 
+  pre_tasks:
+  - name: tell nagios to shush w.r.t. the backend since it usually complains
+    nagios: action=downtime minutes=20 service=host host={{ inventory_hostname_short }}{{ env_suffix }}
+    delegate_to: noc01.phx2.fedoraproject.org
+    ignore_errors: true
+
   roles:
   - fedmsg/hub
   - notifs/backend