monitoring: metrics to "how to enable" mapping

[DifferentialOrange]

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

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