APM Sampling is an optional configuration for the APM Tracer.

APM Sampling is a root span based sampling implementation allowing sampled traces to yield representation of all traces. Sampling decision is made based on sampling rules. When a root span (same as trace) is decided to be sampled, the root span and all children spans are also sampled. When a root span is not sampled, then all children span are not sampled.

For information about configuring APM Sampling for APM Tracer or APM Agent, see Configure APM Sampling.