Enricher: Make audit line source pluggable

[mhils]

What type of PR is this?

/kind feature

What this PR does / why we need it:

This PR makes the Enricher audit source pluggable. There are no functional changes, but I'm preparing a second PR which adds an eBPF-based backend usable in clusters where auditd/syslog is disabled.

Which issue(s) this PR fixes:

None

Does this PR have test?

Yes.

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

[k8s-ci-robot]

Hi @mhils. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[ccojocar]

/ok-to-test

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 3.77358% with 153 lines in your changes missing coverage. Please review.

Project coverage is 23.57%. Comparing base (11d77f4) to head (92c063d).
Report is 852 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2868       +/-   ##
===========================================
- Coverage   45.50%   23.57%   -21.93%     
===========================================
  Files          79      119       +40     
  Lines        7782    20272    +12490     
===========================================
+ Hits         3541     4779     +1238     
- Misses       4099    15254    +11155     
- Partials      142      239       +97     

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ccojocar, mhils

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• OWNERS [ccojocar]

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[ccojocar]

/lgtm