[FEATURE] Harvester logging supports sending log to Graylog via UDP based syslog

[w13915984028]

Is your feature request related to a problem? Please describe.

Harvester logging supports send log to Graylod via udp based syslog

Describe the solution you'd like

The logging center in cluster sends log to different log server via related plugin.

Describe alternatives you've considered

Additional context

The integration with Graylog is summarized in

https://github.com/w13915984028/harvester-develop-summary/blob/main/integrate-harvester-logging-with-log-servers.md

EPIC:
#577

HEP DOC:
https://github.com/joshmeranda/harvester/blob/logging/enhancements/20220525-system-logging.md

[w13915984028]

About TEST:

WAIT unti harvester/harvester-installer#331 is merged.

Manual test is ready: (use kubectl to create flow, receiver)
refer: https://github.com/w13915984028/harvester-develop-summary/blob/main/integrate-harvester-logging-with-log-servers.md

UI based test, ((use Harvester UI' to create flow, receiver`)
wait: #2646

[harvesterhci-io-github-bot]

Pre Ready-For-Testing Checklist

• If labeled: require/HEP Has the Harvester Enhancement Proposal PR submitted?
  The HEP PR is at: [HEP] Logging [CI SKIP]  #2482

• Where is the reproduce steps/test steps documented?
  The reproduce steps/test steps are at:
  https://github.com/w13915984028/harvester-develop-summary/blob/main/integrate-harvester-logging-with-log-servers.md

* [ ] Is there a workaround for the issue? If so, where is it documented? The workaround is at:

• Have the backend code been merged (harvester, harvester-installer, etc) (including backport-needed/*)?
  The PR is at: Feat578 audit and event log harvester-installer#333

  • Does the PR include the explanation for the fix or the feature?

  • Does the PR include deployment change (YAML/Chart)? If so, where are the PRs for both YAML file and Chart?
    The PR for the YAML change is at: Feat578 audit and event log harvester-installer#333

* [ ] **If labeled: area/ui** Has the UI issue filed or ready to be merged? The UI issue/PR is at:

• If labeled: require/doc, require/knowledge-base Has the necessary document PR submitted or merged?
  The documentation/KB PR is at:

• If NOT labeled: not-require/test-plan Has the e2e test plan been merged? Have QAs agreed on the automation test case? If only test case skeleton w/o implementation, have you created an implementation issue?
  • The automation skeleton PR is at:
  • The automation test case PR is at:

* [ ] **If the fix introduces the code for backward compatibility** Has a separate issue been filed with the label `release/obsolete-compatibility`? The compatibility issue is filed at:

[harvesterhci-io-github-bot]

Automation e2e test issue: harvester/tests#498

[w13915984028]

FOR TEST:

In v1.1.0, test logging/event/audit output type of: Graylog, Splunk, they are required by customers;
webhook server is for quick validation.

Set output manually :
How to send log to graylog:
https://github.com/w13915984028/harvester-develop-summary/blob/main/integrate-harvester-logging-with-log-servers.md

Test logging, audit, event with webhook server
https://github.com/w13915984028/harvester-develop-summary/blob/main/test-log-event-audit-with-webhook-server.md

Set output in UI:
#2646
[FEATURE] Config logging in Harvester Dashboard

#2749
[FEATURE] Harvester UI support config (cluster) flow & output for kube-audit log and event log

[lanfon72]

Closed as verified along with #2647, #2747, #2748