[RFE] Enhancement of Conntrack features for Collectd plugin

[Pradipta Kumar Sahoo]

The existing conntrack plugin doesn't segregate as per the protocol level and doesn't have statistic counters.

We need to enhance the below commands to monitor the Conntrack details at a more granular level.

1. Native Conntrack filter:
    - Track UDP protocol: conntrack -L --protonum UDP
    - Track TCP protocol: conntrack -L --protonum TCP
    - Event tracker for UDP: conntrack -E --protonum UDP
    - Event tracker for TCP: conntrack -E --protonum TCP
    - Conntrack Statistics per CPU level: conntrack -S

2. Calculating conntrack memory usage
    $ cat /proc/slabinfo | head -n2; cat /proc/slabinfo | grep conntrack

3. OVS-Conntrack:
    ovs-appctl dpctl/ct-stats-show -m
    ovs-appctl dpctl/dump-conntrack -s -m

[Sanjay Chari (sanjaychari)]

https://review.opendev.org/c/x/browbeat/+/819423