changelog and error message

open-telemetry · Nov 23, 2021 · 924d7b4 · 924d7b4
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diff --git a/src/OpenTelemetry/CHANGELOG.md b/src/OpenTelemetry/CHANGELOG.md
@@ -14,6 +14,9 @@
 aggregation is not implemented yet.
 ([#2660](https://github.com/open-telemetry/opentelemetry-dotnet/pull/2660))
 
+* Refactored temporality setting to align with the latest spec.
+  ([#2666](https://github.com/open-telemetry/opentelemetry-dotnet/pull/2666))
+
 ## 1.2.0-beta2
 
 Released 2021-Nov-19

diff --git a/src/OpenTelemetry/Metrics/MetricReader.cs b/src/OpenTelemetry/Metrics/MetricReader.cs
@@ -53,7 +53,7 @@ public AggregationTemporality Temporality
             {
                 if (this.temporality != AggregationTemporalityUnspecified)
                 {
-                    throw new NotSupportedException(); // TODO: add details
+                    throw new NotSupportedException($"The temporality cannot be modified (the current value is {this.temporality}).");
                 }
 
                 this.temporality = value;