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Clarify that tail-based sampling is only available for ES output #4734

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Jan 3, 2025
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Clarify that tail-based sampling is only available for ES output #4734

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3 changes: 2 additions & 1 deletion docs/en/observability/apm/configure/sampling.asciidoc
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Expand Up @@ -4,7 +4,8 @@
****
image:./binary-yes-fm-yes.svg[supported deployment methods]

Most options on this page are supported by all APM Server deployment methods.
Most options on this page are supported by all APM Server deployment methods when writing to {es}.
If you are using a different <<apm-configuring-output,output>>, tail-based sampling is _not_ supported.
****

Tail-based sampling configuration options.
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6 changes: 6 additions & 0 deletions docs/en/observability/apm/data-model/transactions/sampling.asciidoc
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Expand Up @@ -115,6 +115,12 @@ Refer to the documentation of your favorite OpenTelemetry agent or SDK for more
[[apm-tail-based-sampling]]
== Tail-based sampling

[NOTE]
====
Tail-based sampling is only supported when writing to {es}.
If you are using a different <<apm-configuring-output,output>>, tail-based sampling is _not_ supported.
====

In tail-based sampling, the sampling decision for each trace is made after the trace has completed.
This means all traces will be analyzed against a set of rules, or policies, which will determine the rate at which they are sampled.

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