Add sampleLimit to ServiceMonitor

[TheEdgeOfRage]

title: Add sampleLimit to ServiceMonitor
chore: Support optionally setting the prometheus scrape sampleLimit parameter on the ServiceMonitor

How was this change tested?

Running helm template with various values

Does this change impact docs?

• Yes, PR includes docs updates
• Yes, issue opened: #
• No

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

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[DerekFrank]

Could you add more details about your usecase? I understand the general need for limiting the samples, but is your goal to up the default or to limit it because you're hitting scrape timeouts?

[TheEdgeOfRage]

We have a global sample limit configured on prometheus to 10k, which causes it to fail to scrape karpenter, since it exposes a lot more than that (around 70k IIRC). We still want to have the default scrape limit on prometheus to protect against too high metric cardinality on our services, but allow specific services to override the limit when needed, like here

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Built from commit 84d7418763eb5af9464d1c1e1a18712d07f452e9

[coveralls]

Pull Request Test Coverage Report for Build 18603766286

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 67.517%

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Totals
Change from base Build 18576086927:	0.0%
Covered Lines:	7782
Relevant Lines:	11526

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💛 - Coveralls

[DerekFrank]

I think that usecase makes sense. Let me double check with some other team members to make sure I'm not missing anything and we can get this merged

[DerekFrank]

Alright, after discussion with the team looks like we're good to go, just update the branch to be up to date and I'll approve!

[TheEdgeOfRage]

Updated 👍