Bryan Boreham c0e36e6bb3 Standardise exemplar label as "trace_id" ...

This is consistent with the OpenTelemetry standard, and an example in OpenMetrics.

https://github.com/open-telemetry/opentelemetry-specification/blob/89aa01348139/specification/metrics/data-model.md#exemplars
https://github.com/OpenObservability/OpenMetrics/blob/138654493130/specification/OpenMetrics.md#exemplars-1

Signed-off-by: Bryan Boreham <bjboreham@gmail.com>

2024-02-15 14:20:08 +00:00

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Standardise exemplar label as "trace_id"

2024-02-15 14:20:08 +00:00