[skip-ci] docs: Add comprehensive Prometheus metrics reference

[wazir-ahmed]

• Add a complete Prometheus metrics catalog documenting all metrics exposed by ProxySQL, organized by functional area with support matrix for MySQL and PostgreSQL protocols (docs/references/prometheus_metrics.md)

• Also reorganize global variable references into a dedicated references section for improved discoverability.

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[gemini-code-assist]

Summary of Changes

Hello @wazir-ahmed, 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 significantly enhances the documentation by introducing a detailed reference for all Prometheus metrics exposed by ProxySQL, categorized by functional area and indicating support for MySQL and PostgreSQL protocols. Concurrently, it undertakes a major reorganization of existing global variable documentation, moving it into a new, centralized 'references' section to improve overall structure and user navigation.

Highlights

• New Prometheus Metrics Reference: A comprehensive catalog of all Prometheus metrics exposed by ProxySQL has been added, organized by functional area and detailing support for MySQL and PostgreSQL protocols.
• Documentation Reorganization: All global variable documentation has been moved into a new, dedicated 'references' directory to centralize reference materials and improve discoverability.
• Link Updates: Internal links across the documentation, including navigation and content links, have been updated to reflect the new 'references' directory structure.

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Changelog

• docs/features/sqlite3_server.md
  • Updated internal link to SQLite3 server variables.
• docs/genai/mcp_endpoints.md
  • Updated internal link to MCP variables.
• docs/genai/mcp_integration.md
  • Updated multiple internal links to MCP variables.
• docs/genai/mcp_server.md
  • Updated internal link to MCP variables.
• docs/genai/rag_overview.md
  • Updated internal link to MCP variables.
• docs/global_variables/admin_variables.md
  • Renamed to docs/references/admin_variables.md.
• docs/global_variables/global_variables.md
  • Renamed to docs/references/global_variables.md.
• docs/global_variables/mcp_variables.md
  • Renamed to docs/references/mcp_variables.md.
• docs/global_variables/mysql_monitor_variables.md
  • Renamed to docs/references/mysql_monitor_variables.md.
• docs/global_variables/mysql_variables.md
  • Renamed to docs/references/mysql_variables.md.
• docs/global_variables/pgsql_monitor_variables.md
  • Renamed to docs/references/pgsql_monitor_variables.md.
• docs/global_variables/pgsql_variables.md
  • Renamed to docs/references/pgsql_variables.md.
• docs/global_variables/quick-reference.md
  • Removed the quick reference for global variables.
• docs/global_variables/sqliteserver_variables.md
  • Renamed to docs/references/sqliteserver_variables.md.
• docs/main_runtime/configuration_tables.md
  • Updated internal links to admin and global variables.
• docs/prometheus_metrics/prometheus_metrics.md
  • Added a new introductory line linking to the comprehensive Prometheus metrics reference.
• docs/references/prometheus_metrics.md
  • Added a new file detailing all Prometheus metrics.
• docusaurus.config.ts
  • Updated the navigation link for the global variables reference.
• sidebars.ts
  • Updated sidebar entries to reflect the new 'references' directory structure and added the new Prometheus metrics reference.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[gemini-code-assist]

Code Review

This pull request introduces a comprehensive reference for Prometheus metrics and reorganizes the documentation by moving global variable references into a dedicated references section. These changes significantly improve the structure and discoverability of the documentation. The new metrics reference is detailed and a valuable addition. My review includes a few suggestions to correct minor inconsistencies and potential typos in the new metrics documentation to further enhance its clarity and accuracy.

[renecannao]

@wazir-ahmed : skip-ci ....