Distro release 1.8.4 (#44626)

* Distro release 1.8.4

* Update date

Author: rads-1996

sdk/monitor/azure-monitor-opentelemetry/CHANGELOG.md

@@ -1,19 +1,13 @@
 # Release History
 
-## 1.8.4 (Unreleased)
+## 1.8.4 (2026-01-13)
 
 ### Features Added
 - Added support for OTEL_TRACES_SAMPLER
   ([#44535](https://github.com/Azure/azure-sdk-for-python/pull/44535))
 - Added ability to add additional Log Record Processors and Metric Readers via configure_azure_monitor
   ([#44367](https://github.com/Azure/azure-sdk-for-python/pull/44367))
 
-### Breaking Changes
-
-### Bugs Fixed
-
-### Other Changes
-
 ## 1.8.3 (2025-12-04)
 
 ### Breaking Changes