NETOBSERV-2606: increase default cacheActiveTimeout to 15s

[jotak]

Description

Increase default cacheActiveTimeout to 15s
Adapt cacheMaxFlows to 120K - betting it's still sufficient to cache all the flows, but we can increase more if we find problems in our perf tests

Add more info in README about fine tuning.

Dependencies

n/a

Checklist

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[openshift-ci-robot]

@jotak: This pull request references NETOBSERV-2606 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the story to target the "4.22.0" version, but no target version was set.

Details

In response to this:

Description

Increase default cacheActiveTimeout to 15s
Adapt cacheMaxFlows to 120K - betting it's still sufficient to cache all the flows, but we can increase more if we find problems in our perf tests

Add more info in README about fine tuning.

Dependencies

n/a

Checklist

If you are not familiar with our processes or don't know what to answer in the list below, let us know in a comment: the maintainers will take care of that.

• Is this PR backed with a JIRA ticket? If so, make sure it is written as a title prefix (in general, PRs affecting the NetObserv/Network Observability product should be backed with a JIRA ticket - especially if they bring user facing changes).
• Does this PR require product documentation?
• If so, make sure the JIRA epic is labeled with "documentation" and provides a description relevant for doc writers, such as use cases or scenarios. Any required step to activate or configure the feature should be documented there, such as new CRD knobs.
• Does this PR require a product release notes entry?
• If so, fill in "Release Note Text" in the JIRA.
• Is there anything else the QE team should know before testing? E.g: configuration changes, environment setup, etc.
• If so, make sure it is described in the JIRA ticket.
• QE requirements (check 1 from the list):
• Standard QE validation, with pre-merge tests unless stated otherwise.
• Regression tests only (e.g. refactoring with no user-facing change).
• No QE (e.g. trivial change with high reviewer's confidence, or per agreement with the QE team).

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.89%. Comparing base (4b09e40) to head (d37cfd7).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2412      +/-   ##
==========================================
+ Coverage   71.80%   71.89%   +0.08%     
==========================================
  Files          93       93              
  Lines       10567    10567              
==========================================
+ Hits         7588     7597       +9     
+ Misses       2495     2490       -5     
+ Partials      484      480       -4     

Flag	Coverage Δ
unittests	71.89% <ø> (+0.08%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
api/flowcollector/v1beta2/flowcollector_types.go	100.00% <ø> (ø)

... and 3 files with indirect coverage changes

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[memodi]

@jotak should we wait on this to merge to not make FLP memory increase investigation murky?

also, cc @gwynnemonahan since this will probably need docs update as well