Add Perses to monitor example

[pavolloffay]

Which problem is this PR solving?

Description of the changes

How was this change tested?

Checklist

• I have read https://github.com/jaegertracing/jaeger/blob/master/CONTRIBUTING_GUIDELINES.md
• I have signed all commits
• I have added unit tests for the new functionality
• I have run lint and test steps successfully
  • for jaeger: make lint test
  • for jaeger-ui: yarn lint and yarn test

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.47%. Comparing base (43d2367) to head (a819d25).

Additional details and impacted files

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  Coverage   96.47%   96.47%           
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  Lines       20107    20107           
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tailsampling-processor	0.47% <ø> (ø)
unittests	95.38% <ø> (ø)

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[jkowall]

Looks good, thanks!

[yurishkuro]

What's the objective?

[jkowall]

@yurishkuro we can use Grafana and Perses to demo the metrics now. Perses is another visualization tool for time series which is part of CNCF. As you are aware Grafana's license could change at some point, so this is nice to have for demo/testing purposes.

[yurishkuro]

I think we should remove grafana as well. The point of the example is to demonstrate SPM capability, not the metrics generation. For debugging purposes Prometheus has a basic UI.

[jkowall]

While I agree with you, we have to think about the user.... Most Jaeger users are also using Grafana which is open source today, so I think it's nice to demo. Grafana can also visualize the Jaeger data which is nice to show.

[yurishkuro]

We also need to think about Jaeger the project. Grafana was added when it only had metrics. Now it's a direct competitor with Jaeger UI.

[jkowall]

When I show both in a demo, I explain how Grafana doesn't have the search or other capabilities Jaeger has, however if you want to visualize a trace, they are both capable, same with OpenSearch. The fact is that pretty much every Prometheus user is using Grafana, hence they would likely be using it with Jaeger. These are the facts until Perses gains popularity over the next several years, I hope.