NRPE check should look for 'OVS is dead' in /var/log/neutron/neutron-openvswitch-agent.log

Requesting a check of a log file to ensure that "OVS is dead" is not present in the neutron-openvswitch-agent.log.

sudo grep "OVS is dead" /var/log/neutron/neutron-openvswitch-agent.log

2021-03-30 18:33:37.135 132498 WARNING neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent [req-ddc818fe-eec7-45ec-a861-ff39c75d924c - - - - -] OVS is dead. OVSNeutronAgent will keep running and checking OVS status periodically.
2021-03-30 18:38:37.137 132498 WARNING neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent [req-ddc818fe-eec7-45ec-a861-ff39c75d924c - - - - -] OVS is dead. OVSNeutronAgent will keep running and checking OVS status periodically.

We've found this message occurs on a 5min interval, so the check would need to observe the history of this log over a long interval -- but not too long. Something like (N-threshold times in the last 30min) where n maybe configurable and defaults to 3 so the first alert is 15 minutes after the first occurance.