Cardinality
The number of distinct values present in a telemetry attribute or label dimension, a major determinant of observability storage and query cost.
Boundaries
Telemetry cardinality refers to distinct label or attribute values, not simply the number of emitted metric samples.
Related Concepts
- Metric
- OpenTelemetry
- Time Series
- Attribute
Source
- https://opentelemetry.io/docs/concepts/signals/metrics/