Exemplar
A representative event or trace reference attached to an aggregated metric sample so users can jump from a statistical signal to a concrete request.
Observability Context
An exemplar links an aggregated metric observation to a representative event or trace. For example, a high-latency histogram bucket can carry a trace reference that lets an operator move from a statistical signal to one concrete request for debugging.
Sampling Boundary
An exemplar does not imply that every metric sample is traced or retained. It is a sparse correlation bridge between aggregate telemetry and selected detailed observations.