[Stack monitoring] Logstash Pipeline details events are not shown

[philippkahr]

Kibana version:
7.14.0
Elasticsearch version:
7.14.0
Server OS version:
Elasticsearch Cloud
Browser version:
14.1.2 Safari
Browser OS version:
macOS 11.5.1
Original install method (e.g. download page, yum, from source, etc.):
Cloud
Describe the bug:

When you go to a freshly deployed pipeline it takes around ~20-30 minutes until the events per second data shows up.

I understand that this is happening due to the way it is calculated. I just think that there should be a disclaimer or notification coming in, informing the user that it will take up to 20-30 minutes until EPS data is properly shown. Otherwise the user might be confused, why the pipeline shows any amount of ingress but 0 events per second in the pipeline details.

Steps to reproduce:

1. Activate logstash monitoring
2. Create a pipeline
3. Check the pipeline.
4. Wait 30 minutes
5. Check the pipeline again

Expected behavior:

Some sort of note that this is intended behaviour.

Screenshots (if relevant):

Any additional context:
Related #55755

[elasticmachine]

Pinging @elastic/stack-monitoring (Team:Monitoring)