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apm: Document sampling.tail.ttl config #1269

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@carsonip carsonip commented Apr 25, 2025

Document sampling.tail.ttl config

Related to #769
Part of elastic/apm-server#13525

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I wonder if we should hold off from merging it until 9.1 and 8.19 release, because having these unreleased versions in public docs can be confusing.

### Version 8.19+ and 9.1+ [ec_version_8_19_and_9_1]

`apm-server.sampling.tail.ttl`
: Time-to-live (TTL) for trace events stored in the local storage of the APM Server during tail-based sampling. This TTL determines how long trace events are retained in the local storage while waiting for a sampling decision to be made. A greater TTL value increases storage space requirements.

### Version 8.0+ [ec_version_8_0_3]
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[to reviewer] I'm starting to think we should remove all 7.x and 8.x sections, as this is 9.0 docs. It still makes sense to document 9.0 vs 9.1+ though.

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