Arbitrary key/value attributes.
OptionaldurationSpan duration in milliseconds (spans only).
OptionalerrorCaptured error, if any (spans only).
Record kind.
Metric/span name (e.g. stone.event).
Owning service name (from config).
OptionalstatusSpan outcome (spans only).
Wall-clock timestamp (ms) when the record was emitted.
OptionalvalueCounter/gauge value.
A single, exporter-agnostic telemetry record.