Add FLP-based deduper options

[jotak]

Description

FLP-based dedup allows to decrease Loki CPU / memory / storage a lot (~50%) at the cost of minimal loss in data accuracy (e.g. loosing interfaces involved in egress traffic)

Dependencies

n/a

Checklist

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[jotak]

@jpinsonneau a possibility could be to add a "Merge" mode here that would involve infinispan like in your PoC

[jpinsonneau]

Sounds good; but should we offer all of these or just support one or two modes in the end ?

[jotak]

I see pros and cons on every mode and no clear "winner"

• Disabled to make sure we get every flow / not loosing anything
• Infinispan-based is similar but with performance impacts (positive on Loki, negative on FLP) and adds a new component, so it requires more configuration
• Drop is the best for overall performance but looses data
• Sample offers a compromise between Drop and Disabled, providing statistical samples of dropped flows

[codecov]

Codecov Report

Attention: Patch coverage is 29.07801% with 100 lines in your changes are missing coverage. Please review.

Project coverage is 66.63%. Comparing base (efc42ca) to head (5e7bbbd).
Report is 4 commits behind head on main.

Files	Patch %	Lines
controllers/flp/flp_pipeline_builder.go	30.76%	44 Missing and 1 partial ⚠️
...s/flowcollector/v1beta1/zz_generated.conversion.go	8.33%	22 Missing ⚠️
...pis/flowcollector/v1beta1/zz_generated.deepcopy.go	0.00%	14 Missing ⚠️
...pis/flowcollector/v1beta2/zz_generated.deepcopy.go	0.00%	13 Missing and 1 partial ⚠️
pkg/helper/flowcollector.go	66.66%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #591      +/-   ##
==========================================
- Coverage   67.38%   66.63%   -0.75%     
==========================================
  Files          65       65              
  Lines        7987     8081      +94     
==========================================
+ Hits         5382     5385       +3     
- Misses       2276     2365      +89     
- Partials      329      331       +2     

Flag	Coverage Δ
unittests	66.63% <29.07%> (-0.75%)	⬇️

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PR needs rebase.

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