OVS Process metrics cannot be collected through the PID file location

[girishmg]

the ovnkube-node daemon that runs on the node doesn't share the process namespace with the host and therefore will not be able to collect any ovs-vswitchd or ovsdb-server related processes.

@trozet @tssurya @jcaamano another issue in the metrics module

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[trozet]

@girishmg it does when not running in unprivleged mode? https://github.com/ovn-org/ovn-kubernetes/blob/master/dist/templates/ovnkube-node.yaml.j2#L34

[girishmg]

when not running in unprivleged

@trozet privileged or unprivileged mode refers to whether ovnkube-node daemon can exec into Pod NS and setup networking on Pod's interface.

In privileged mode ovnkube, CMD_ADD and CMD_DEL occur from within the running ovnkube-node daemon.

In unprivileged mode onvkube, CMD_ADD and CMD_DEL returns a result and the ovn-k8s-cni-overlay binary takes that results and does interface plumbing inside the Pod namespace.

In both the cases, ovnkube-node doesn't share the PID namespace of the host.

[girishmg]

@girishmg it does when not running in unprivleged mode? https://github.com/ovn-org/ovn-kubernetes/blob/master/dist/templates/ovnkube-node.yaml.j2#L34

You are right. I have fixed the PR accordingly, can you PTAL?