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[docs] Add INFO for Agent Config with DT #43301

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Aug 14, 2019
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[docs] Add INFO for Agent Config with DT #43301

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5 changes: 5 additions & 0 deletions docs/apm/agent-configuration.asciidoc
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Expand Up @@ -43,3 +43,8 @@ Adjusting the sampling rate controls what percent of requests are traced.
`1.0` means _all_ requests are traced. If you set the `TRANSACTION_SAMPLE_RATE` to a value below `1.0`,
the agent will randomly sample only a subset of transactions.
Unsampled transactions only record the name of the transaction, the overall transaction time, and the result.

IMPORTANT: In a distributed trace, the sampling decision is propagated by the initializing Agent.
This means if you're using multiple agents, only the originating service's sampling rate will be used.
Be sure to set sensible defaults in _all_ of your agents, especially the
{apm-rum-ref}/configuration.html#transaction-sample-rate[JavaScript RUM Agent].