docs: Add Operations Guide (Prometheus Metrics & Troubleshooting)

[fromsaurav]

This PR introduces the Markdown files for a new "Operations Guide" under the docs/operations/ directory. This guide is intended to help users and operators effectively monitor, troubleshoot, and maintain OpenKruise installations.

Key Documentation Files Added:

• docs/operations/README.md: An introductory page for the operations guide.
• docs/operations/prometheus-metrics.md:
  • Details on enabling and accessing OpenKruise metrics.
  • Categorization of key metrics.
  • Guidance on setting up Prometheus ServiceMonitor and example alerting rules.
  • A compact, example Grafana dashboard JSON.
• docs/operations/troubleshooting.md:
  • General troubleshooting methodology.
  • Specific troubleshooting steps for controllers, webhooks, and various Kruise workloads.
  • Common error messages and diagnostic commands.

Purpose:

These files provide the core content for an operational guide. The navigation for these documents on the openkruise.io website will be added via a separate Pull Request to the openkruise/openkruise.io repository.

Related Issue (Clarification):

This PR provides operational documentation. It does not directly address or fix feature request #1672 ("Support for configmaps grayscale publishing"), which is a feature implementation task. A pr from openkruise.io will be linked to this pr which would be a feature implementing pr.

How to Review:

• Check the content of the new Markdown files in docs/operations/ for clarity, accuracy, and completeness.
• Verify the correctness of commands and YAML examples within the documentation.

Looking forward to feedback!

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 43.76%. Comparing base (ff8dcec) to head (0998e84).
Report is 4 commits behind head on master.

Additional details and impacted files

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- Coverage   43.78%   43.76%   -0.02%     
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  Files         316      316              
  Lines       31617    31617              
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- Hits        13842    13838       -4     
  Misses      16378    16378              
- Partials     1397     1401       +4     

Flag	Coverage Δ
unittests	43.76% <ø> (-0.02%)	⬇️

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[fromsaurav]

hey @zmberg @Fei-Guo , In the '/openkruise.io` added "Operations Guide" to sidebars.js and docs/. The category isn't showing in the local sidebar preview despite a successful build and cache clearing; I'd appreciate a review of the sidebars.js integration to link that upcoming pr with this one.

[furykerry]

the operations guide should be put in the document repository

[fromsaurav]

the operations guide should be put in the document repository

okay, i'll update this ! Thanks