The Elastic APM integration became generally available in 7.16 — see the APM Guide for updated documentation. Standalone APM Server users can see the Legacy APM Overview and Legacy APM Server Reference.
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APM Transaction Metrics fieldsedit

APM transaction metrics, and transaction metrics-specific properties, requiring licensed features such as the histogram field type.

transaction.duration.histogram

Pre-aggregated histogram of transaction durations.

type: histogram

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