[FEATURE]:Add documentation for environment variables related to OTEL support

[linghengqian]

Feature hasn't been suggested before.

• I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

Although #14246 (comment) mentions that OpenCode already supports OTEL, this is never documented at https://opencode.ai/docs/ .

I believe the documentation needs to properly document how to configure OTEL support and how to integrate with third-party APM platforms like https://github.com/apache/skywalking or https://github.com/elastic/apm .

Also see #35394 .

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• [FEATURE]: Add documentation for environment variables related to OTEL support #35394: Identical feature request (same title, same description, same author) — currently closed

[linghengqian]

This issue might be a duplicate of existing issues. Please check:

I am, of course, aware that this issue is a duplicate of #35394. However, you keep requiring me to open a new issue every 60 days, even when the content is exactly the same as before.

To stay organized issues are automatically closed after 60 days of no activity. If the issue is still relevant please open a new one.