[stable/fluent-bit] feature - add support for lua filter

[daniel-ciaglia]

What this PR does / why we need it:

Fluent Bit supports Lua as Filter. I enabled that feature in this chart - see the fluent-bit documentation

The Lua script is provided as raw data as shown below and must be referenced as extra.lua in the FILTER

filter:
  lua:
    enabled: true
    raw: |-
    # example callback
      function cb_print(tag, timestamp, record)
        return code, timestamp, record
      end

The filter can then be configured like this:

rawConfig: |
  @INCLUDE fluent-bit-service.conf
  @INCLUDE fluent-bit-input.conf
  @INCLUDE fluent-bit-filter.conf
  [FILTER]
      Name    lua
      Match   *
      script  extra.lua
      call    cb_print
  @INCLUDE fluent-bit-output.conf

Special notes for your reviewer:

This PR already incorporates PR #15775
Please check @kfox1111, @edsiper, @hectorj2f

Checklist

[Place an '[x]' (no spaces) in all applicable fields. Please remove unrelated fields.]

• DCO signed
• Chart Version bumped
• Variables are documented in the README.md
• Title of the PR starts with chart name (e.g. [stable/chart])

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: daniel-ciaglia
To complete the pull request process, please assign towmeykaw
You can assign the PR to them by writing /assign @towmeykaw in a comment when ready.

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• stable/fluent-bit/OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[k8s-ci-robot]

Hi @daniel-ciaglia. Thanks for your PR.

I'm waiting for a helm 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.

I understand the commands that are listed here.

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/test-infra repository.

[daniel-ciaglia]

/assign @Towmeykaw

[kfox1111]

What is the ramification of this being removed?

[daniel-ciaglia]

Please check the PR #15775 for details on that.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Any further update will cause the issue/pull request to no longer be considered stale. Thank you for your contributions.

[stale]

This issue is being automatically closed due to inactivity.

[Allex1]

:(

[khauser]

@daniel-ciaglia @kfox1111 What was happening with this pull-request?

[daniel-ciaglia]

@khauser @kfox1111 - nothing happend from my side to this PR.
We're using internal clones of the charts for now with the proposed changes applied.

[hectorj2f]

Perhaps @daniel-ciaglia should re-open it

[daniel-ciaglia]

Hi @hectorj2f, I don't have the option available to re-open the PR.