out_parseable: Parseable plugin for fluentbit

[AdheipSingh]

Send kubernetes logs to https://www.parseable.com/

• Here is the API doc for ingesting into parseable.

https://www.postman.com/parseable/parseable/request/au1fn5d/send-logs-to-a-log-stream-with-http-header

• Here is the sample config i am using.

      inputs: |
      [INPUT]
          Name tail
          Path /var/log/containers/*.log
          multiline.parser docker, cri
          Tag kube.*
          Mem_Buf_Limit 5MB
          Skip_Long_Lines On

      [INPUT]
          name kubernetes_events
          tag k8s_events

      [INPUT]
          Name systemd
          Tag host.*
          Systemd_Filter _SYSTEMD_UNIT=kubelet.service
          Read_From_Tail On

    ## https://docs.fluentbit.io/manual/pipeline/filters
    filters: |
      [FILTER]
          Name                kubernetes
          Match               kube.*
          Merge_Log           On
          Keep_Log            Off
          K8S-Logging.Parser  On
          K8S-Logging.Exclude On

    ## https://docs.fluentbit.io/manual/pipeline/outputs
    outputs: |
      [OUTPUT]
          Name parseable
          Match kube.*
          Server_Host parseable.parseable.svc.cluster.local
          Username admin
          Password admin
          Server_Port 80
          Stream $NAMESPACE
          Exclude_Namespaces kube-system, default

      [OUTPUT]
          Name parseable
          Match k8s_events
          Server_Host parseable.parseable.svc.cluster.local
          Server_Port 80
          Username admin
          Password admin
          Stream k8s-events 

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Testing
Before we can approve your change; please submit the following in a comment:

• Example configuration file for the change
• Debug log output from testing the change

• Attached Valgrind output that shows no leaks or memory corruption was found

If this is a change to packaging of containers or native binaries then please confirm it works for all targets.

• Run local packaging test showing all targets (including any new ones) build.
• Set ok-package-test label to test for all targets (requires maintainer to do).

Documentation

• Documentation required for this feature

Backporting

• Backport to latest stable release.

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Fluent Bit is licensed under Apache 2.0, by submitting this pull request I understand that this code will be released under the terms of that license.

[patrick-stephens]

We will need some tests for this.

[AdheipSingh]

We will need some tests for this.

@patrick-stephens - how do you run tests locally ?
within build folder i have executed cmake -DFLB_TESTS_INTERNAL=ON -DFLB_TESTS_RUNTIME=ON ..
but somehow make test does not build any binary in build/bin/ folder.

can you please guide here ?

[AdheipSingh]

merge conflict causing issues in this PR. Please refer to the fresh PR #9872