add changelog

Signed-off-by: emdneto <[email protected]>

Author: emdneto

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+- prometheus-exporter: fix labels out of place for data points with different
+  attribute sets
+  ([#4413](https://github.com/open-telemetry/opentelemetry-python/pull/4413))
+
 ## Version 1.30.0/0.51b0 (2025-02-03)
 
 - Always setup logs sdk, OTEL_PYTHON_LOGGING_AUTO_INSTRUMENTATION_ENABLED only controls python `logging` module handler setup