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open-telemetry
Update java sampling documentation page
Contributes to #2548
Follows up on a few comments in #4199
What I added/changed:
- Documented the ability to configure with environment variables in a top-level section in this guide, added link to configuration page with all options.
- Added a note above the custom code section about other ways of sampling (agent, spring starter etc)
- Emphasized that most the defaults suffice for most users, and that most users don't need to customize the sampler.
- Removed the production guidance at the bottom of the page - there seemed to be some pushback in the original PR and I also didn't find the recommendation to be very clear. I can add back in or update if needed.
- Added some more context about the different sampler types
- Tried to follow similar layouts and content as other languages, but there isn't a whole lot of consistency.
