1. Proposed title of this feature request

Add NFNetlink queue metrics to node exporter.

2. What is the nature and description of the request?

Scrape metrics from `/proc/net/netfilter/nfnetlink_queue` into the openshift monitoring stack.

3. Why does the customer need this? (List the business requirements here)

Applications such as Palo Alto defender use nf-netlink queues to intercept and accept/deny network flows. By monitoring these metrics, we can provide quicker RCA/alerting when this affects the platform itself, as customers will introduce a policy into Defender that results in a degraded OCP cluster.

4. List any affected packages or components.

node-exporter