Add network exporter localprobe#12003
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Since we now have the network-node exporter and a picture of all subnets with IP assignment from the DB we must not rely on the readiness probes anymore. This will allow more granular alerting.
In the past this was done querying the neutron-api, asking for agents assgigned to the agent and then comparing that to the netns/bridges locally. This put some load on the api as we have a few dozen network agents in each region, each asking the api for their networks. With the network-node-exporter in place, we can also ask prometheus-openstack for that information, shifting that load from the neutron-api to prometheus, which pretty much already has that data lying around. I hope this 1) reduces our dependency to a slow neutron-api leading to failing readyness probes, and 2) reduces the load generated though dozens of agents asking for their assigned networks.
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