Update CHANGELOG.

open-telemetry · Mar 5, 2024 · ec4849e · ec4849e
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diff --git a/src/OpenTelemetry/CHANGELOG.md b/src/OpenTelemetry/CHANGELOG.md
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   Specification](https://github.com/open-telemetry/opentelemetry-specification/pull/3820).
   ([#5404](https://github.com/open-telemetry/opentelemetry-dotnet/pull/5404))
 
+* **Experimental (pre-release builds only):** The `ExemplarFilter` used by SDK
+  `MeterProvider`s can now be controlled via the `OTEL_METRICS_EXEMPLAR_FILTER`
+  environment variable. For details see: [OpenTelemetry Environment Variable
+  Specification](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/configuration/sdk-environment-variables.md#exemplar).
+  ([#5412](https://github.com/open-telemetry/opentelemetry-dotnet/pull/5412))
+
 ## 1.7.0
 
 Released 2023-Dec-08