monitoring: metrics to "how to enable" mapping

Product: Tarantool/tools (metrics)
Since: product version
Audience/target: developers/support
Root document: Monitoring section
SME: @DifferentialOrange @yngvar-antonsson

Details

We already have a Metrics reference section which covers available metrics, as well as Metrics API reference, which covers thing like "how to enable/disable general metrics" and "how to enable psutils CPU metrics". It would be nice to have a note/link for each Metrics reference metric to a documentation section which covers how one should enable it.

Inspired by this Community chat discussion

Planning checklist

• Pick product label:
  • server for Tarantool core
  • cartridge,
  • tdg, or
  • ecosystem
    for tools and connectors.
• Pick type label:
  • reference,
  • getting started,
  • user_guide, etc.
• Estimate complexity in storypoints in the title
• Add to Documentation board → Backlog

Note: issue templates are in beta. Give your feedback in #1869.

Start with the Monitoring section, especially the Metrics reference and Metrics API reference linked in the issue. Review each metric entry and identify the documentation section covering how to enable it, then add a note or link for every metric. Done means the Metrics reference consistently points readers to the relevant enablement guidance.