fix: resolve dead links flagged by validate-docs CI job

[GrammaTonic]

Summary

Fixes all dead links reported by the validate-docs job in the Docs & Wiki Validation workflow.

Changes

.markdown-link-check.json - Strengthen ignore patterns:

• Simplified localhost pattern to reliably match all local URLs
• Broadened GitHub user URL pattern to cover all user-scoped pages
• Added mailto: pattern to prevent false positives from @-containing package names
• Added computerhope.com pattern for bot-blocked external site

docs/features/PROMETHEUS_IMPROVEMENTS.md - Updated dead GitHub docs link to the current URL

docs/features/GRAFANA_DASHBOARD_METRICS.md - Replaced bot-blocked computerhope.com netcat link with man7.org ncat man page

docs/releases/RELEASE_NOTES_v2.2.0.md - Changed bold tar@7.5.2 to backtick formatting to prevent mailto false positive

Dead links resolved

Link	Status	Fix
mailto:tar@7.5.2	400 (false positive)	Backtick formatting + mailto ignore
computerhope.com/unix/nc.htm	403 (bot-blocked)	Replaced + ignore pattern
github.com/users/.../projects/5	404 (private)	Broadened ignore pattern
localhost:9090/3000/9091-3	0 (unreachable)	Simplified ignore pattern
docs.github.com monitoring URL	404 (URL moved)	Updated to current URL

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses and resolves all dead links identified by the validate-docs CI job. It improves the robustness of the documentation link validation process by refining ignore patterns and directly correcting broken or problematic links within the documentation files, ensuring the integrity and accessibility of referenced resources.

Highlights

• Link Validation Configuration: Strengthened ignore patterns in .markdown-link-check.json to improve accuracy, including broader matches for localhost and GitHub user URLs, and new patterns for mailto: and computerhope.com.
• Documentation Link Updates: Corrected a dead GitHub documentation link in docs/features/PROMETHEUS_IMPROVEMENTS.md to its current URL.
• External Link Replacement: Replaced a bot-blocked computerhope.com link with a reliable man7.org link in docs/features/GRAFANA_DASHBOARD_METRICS.md.
• Formatting Correction: Adjusted the formatting of tar@7.5.2 in docs/releases/RELEASE_NOTES_v2.2.0.md from bold to backticks to prevent a mailto: false positive during link validation.

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Changelog

• .markdown-link-check.json
  • Simplified the localhost pattern to match all local URLs.
  • Broadened the GitHub user URL pattern to cover all user-scoped pages.
  • Added a mailto: pattern to prevent false positives from @-containing package names.
  • Added a computerhope.com pattern for a bot-blocked external site.
• docs/features/GRAFANA_DASHBOARD_METRICS.md
  • Replaced a link to computerhope.com/unix/nc.htm with man7.org/linux/man-pages/man1/ncat.1.html.
• docs/features/PROMETHEUS_IMPROVEMENTS.md
  • Updated the GitHub Actions Monitoring link from docs.github.com/en/actions/hosting-your-own-runners/monitoring-and-troubleshooting-self-hosted-runners to docs.github.com/en/actions/how-tos/manage-runners/self-hosted-runners/monitor-and-troubleshoot.
• docs/releases/RELEASE_NOTES_v2.2.0.md
  • Changed the formatting of tar@7.5.2 from bold (**tar@7.5.2**) to backticks (`tar@7.5.2`).

Activity

• No human activity has occurred on this pull request yet.

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[gemini-code-assist]

Code Review

This pull request resolves several dead links flagged by the CI job. The changes involve strengthening ignore patterns for the link checker, updating outdated URLs in documentation, and adjusting markdown formatting to prevent false positives. Overall, the changes are effective in fixing the reported issues. I have one suggestion to improve the accuracy of a link replacement to ensure it matches the tool referenced in the code examples.