[WIP] Document recommendation for Telegraf with InfluxDB v2

[Copilot]

• Review existing Telegraf documentation structure in /content/shared/influxdb3-write-guides/use-telegraf/
• Create new section in configure.md documenting concurrent_writes recommendation
• Add recommendation to use influxdb_v2 output plugin with concurrent_writes configuration
• Document tuning guidelines: start with min(number of cores / 2, 10)
• Include note that concurrent_writes should be at least 2 in nearly all cases
• Add note about using v2 plugin instead of v1 plugin for v3
• Add concurrent_writes to main configuration example (conditionally for core/enterprise)
• Test the documentation build locally
• Verify rendered output on core and enterprise pages
• Verify it doesn't appear on cloud-dedicated or cloud-serverless
• Run code review and address any feedback
• Run CodeQL security check
• Take screenshots of rendered documentation

Summary

Successfully documented the recommendation for using Telegraf with multiple concurrent writers for InfluxDB v3 Core and Enterprise. The documentation:

1. Added concurrent_writes parameter documentation with:

   • Recommendation to set it to at least 2 in nearly all situations
   • Tuning guidance: start with min(number of CPU cores / 2, 10)
   • Warning that concurrent writes don't guarantee metric ordering

2. Updated configuration examples to include concurrent_writes = 5 (conditionally displayed only for Core and Enterprise versions)

3. Added note about plugin choice: Emphasizes using influxdb_v2 output plugin instead of v1 plugin for InfluxDB v3

4. Updated table of contents to include the new concurrent_writes section

All changes are in the shared content file /content/shared/influxdb3-write-guides/use-telegraf/configure.md, which is automatically included in both Core and Enterprise documentation pages.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Use multiple concurrent writers and the v2 influxdb output plugin with Telegraf</issue_title>
<issue_description> if you're using telegraf to write to monolith, you should be using multiple concurrent writers in nearly every situation. See the docs for the v2 influxdb output plugin: https://github.com/influxdata/telegraf/blob/release-1.36/plugins/outputs/influxdb_v2/README.md
concurrent_writes = 5 # should definitely be at least 2; for tuning, i'd start at min(number of cores for 3ent / 2, 10)
Note: the v1 output plugin for telegraf likely works with v3 but please use the v2 plugin instead.</issue_description>

<agent_instructions>Document the recommendation for using Telegraf with influxdb3/core and influxdb3/enterprise. This can go in /content/shared</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Use multiple concurrent writers and the v2 influxdb output plugin with Telegraf #6561

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