Display OVN metrics from worker node

[venkataanil]

Type of change

• Refactor
• New feature
• Bug fix
• Optimization
• Documentation Update

Description

Prometheus query metric containerCPU-AggregatedWorkers is NOT
using the pod while fetching the data, so fixed that in the
worker panel.

ovnkube-master pod names is replaced with ovnkube-node pod from 4.14.

Related Tickets & Documents

• Related Issue #
• Closes #

Checklist before requesting a review

• I have performed a self-review of my code.
• If it is a core feature, I have added thorough tests.

Testing

• Please describe the System Under Test.
• Please provide detailed steps to perform tests related to this code change.
• How were the fix/results from this change verified? Please provide relevant screenshots or results.

[venkataanil]

@rsevilla87 @mohit-sheth @mukrishn @afcollins @krishvoor @vishnuchalla @smalleni

[rsevilla87]

containerCPU-AggregatedWorkers

Note that the original query was something like:

uuid.keyword: $uuid AND metricName: "containerCPU" AND labels.pod.keyword: /ovnkube-master.*/

where metricName did't have the suffix .keyword, which is basically translated as a wildcard at the end of containerCPU*.
Other than that, that wasn't correct either, as the panels were adding up the per-pod values obtained from containerCPU-Masters, with the average value obtained from containerCPU-AggregatedWorkers, which is not correct at all.

TLTR; This change looks good to me , we just need to fix the issues you're observing with the panels first

[venkataanil]

I retained all old panels. I fixed the panel (i.e Aggregated OVNKube-node containers CPU) which was not worker earlier.
I have tested and got the panels rendered properly.

[rsevilla87]

lgtm