Add "collector troubleshooting" doc

[smithclay]

This adds a short page that generally points users to the existing collector troubleshooting docs.

Two minor additions not covered in the main doc:

• Specifically calls out the "sending test data"/local exporter guidance (anecdotally a useful troubleshooting step for users doing first-time collector setup and not seeing data)
• Adds a high-level checklist of things to verify for complex setups (collectors to collectors, etc)

Think a future section that goes deeper into collector observability would be a great future addition.

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Preview: https://deploy-preview-2382--opentelemetry.netlify.app/docs/collector/troubleshooting/

[cartermp]

This is a great addition and starting point for troubleshooting, thanks!

I also wonder if we can crib some content from vendors about troubleshooting, too. Some of what's in this doc is also helpful, but not all of it. Anyways, happy to take this as-is and iterate on the topic as needed.

[smithclay]

@cartermp Agreed, there's good advice (and useful external tools like otel-cli or https://github.com/fullstorydev/grpcurl and https://github.com/CtrlSpice/otel-desktop-viewer) scattered in many places.

For advice involving non-community but open-source tools, are we prohibited from linking?

[cartermp]

Off-hand I'd say no, definitely not prohibited. Vendor stuff is what's iffy since we can't favor one over another, even if it's done only because a vendor happens to have the best content for a topic :/

[svrnm]

Off-hand I'd say no, definitely not prohibited. Vendor stuff is what's iffy since we can't favor one over another, even if it's done only because a vendor happens to have the best content for a topic :/

We copied some content from vendor's in the past with their approval and adding them into the Acknowledgment section, so I see no issue with doing this once again.

[svrnm]

I am happy to hav this, @smithclay can you give the suggestions from @chalin a look and resolve them, TY!

[smithclay]

@chalin Thanks for the feedback, have pushed the requested changes + rebased.

[chalin]

Thanks. A few more copy edits (you'll probably have to rerun Prettier after accepting them), see inline. Otherwise LGTM.

[chalin]

LGTM, thanks!