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.
APM Transaction Metrics fieldsedit
APM transaction metrics, and transaction metrics-specific properties, requiring licensed features such as the histogram field type.
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transaction.duration.histogram
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Pre-aggregated histogram of transaction durations.
type: histogram