Specify seconds unit for measuring durations (#3388)

open-telemetry · Apr 14, 2023 · 4ac43da · 4ac43da
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -35,6 +35,8 @@ release.
 - Add clarification that UCUM c/s variant applies to all units other than `1` and
   those using [annotations](https://ucum.org/ucum.html#para-curly).
   ([#3393](/~https://github.com/open-telemetry/opentelemetry-specification/pull/3393))
+- Specify that seconds should be used for measuring durations.
+  ([#3388](/~https://github.com/open-telemetry/opentelemetry-specification/pull/3388))
 
 ### Compatibility
 

diff --git a/specification/metrics/semantic_conventions/README.md b/specification/metrics/semantic_conventions/README.md
@@ -194,6 +194,7 @@ use `{packet}`, `{error}`, `{fault}`, etc.
   For example, "Cel" for the unit with full name "degree Celsius".
 - Instruments SHOULD use non-prefixed units (i.e. `By` instead of `MiBy`)
   unless there is good technical reason to not do so.
+- When instruments are measuring durations, seconds (i.e. `s`) SHOULD be used.
 
 ### Instrument Types