Glossary

Term	Definition
Apdex	Score that classifies response times against a configured satisfaction threshold.
Attribute	Typed key-value metadata on a resource, span, event, or link.
Baggage	Context values propagated across service boundaries; separate from span attributes.
Context Propagation	Transfer of trace identity across process or service boundaries.
Event	Timestamped annotation within a span.
Exporter	Component that sends telemetry to a receiver or endpoint.
Instrumentation Scope	Identity of the code library that created telemetry.
Link	Association between spans without a parent-child relationship.
Operation	Stable name for work represented by a span.
Resource	Entity that produced telemetry, such as a service instance or workload.
Root Span	Span with no parent in the trace.
Sampling	Decision that controls which trace data is recorded or forwarded.
Semantic Conventions	Standard names and attributes for telemetry concepts.
Span	Timed unit of work within a trace.
Span Kind	Role of a span, such as client, server, producer, consumer, or internal.
Trace	Set of related spans representing a distributed operation.
Trace ID	Identifier shared by spans in one trace.
Trace Context	Trace and parent identity propagated with a request or message.