NETOBSERV-712 Add metric to measure number of flows per namespace

[jotak]

E.g. to get netobserv flows in percentage of total:

100 * (sum (rate(netobserv_namespace_flows_total{SrcK8S_Namespace="netobserv"}[1m])) + sum (rate(netobserv_namespace_flows_total{SrcK8S_Namespace!="netobserv", DstK8S_Namespace="netobserv"}[1m]))) / sum (rate(netobserv_namespace_flows_total[1m]))

[memodi]

/ok-to-test

[github-actions]

New image: ["quay.io/netobserv/network-observability-operator:ab2cd97"]. It will expire after two weeks.

[memodi]

thanks @jotak - what would be correct query for non-internal netobserv traffic? I am using below which probably is not correct, since I am getting more value than total.

(sum (rate(netobserv_namespace_flows_total{SrcK8S_Namespace!="netobserv"}[1m])) + sum (rate(netobserv_namespace_flows_total{DstK8S_Namespace!="netobserv"}[1m]))

[jotak]

@memodi if I'm correct it's simpler than that, it's just:

sum (rate(netobserv_namespace_flows_total{SrcK8S_Namespace!="netobserv",DstK8S_Namespace!="netobserv"}[1m]))

= all flows where neither source nor dest are from netobserv namespace

[OlivierCazade]

LGTM

[jotak]

thanks @memodi @OlivierCazade
/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jotak

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [jotak]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment