Update min OT version and remove Python 3.8 support (#42246)

* Update min OT versinnd remove Python 3.8 support

* changelog

* move old changelog entries

Author: jeremydvoss

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

@@ -4,12 +4,20 @@
 
 ### Features Added
 
+- Added RateLimited Sampler 
+  ([#41954](https://github.com/Azure/azure-sdk-for-python/pull/41954))
+- Refactored Application Insights Sampler Code
+  ([#42210](https://github.com/Azure/azure-sdk-for-python/pull/42210))
+
 ### Breaking Changes
 
 ### Bugs Fixed
 
 ### Other Changes
 
+- Update minimum version of OpenTelemetry. Remove Python 3.8 support.
+    ([#42246](https://github.com/Azure/azure-sdk-for-python/pull/42246))
+
 ## 1.0.0b40 (2025-07-17)
 
 ### Features Added
@@ -22,10 +30,6 @@
   ([#41950](https://github.com/Azure/azure-sdk-for-python/pull/41950))
 - Customer Facing Statsbeat: Added logic for retry item count
   ([#41971](https://github.com/Azure/azure-sdk-for-python/pull/41971))
-- Added RateLimited Sampler 
-  ([#41954](https://github.com/Azure/azure-sdk-for-python/pull/41954))
-- Refactored Application Insights Sampler Code
-  ([#42210](https://github.com/Azure/azure-sdk-for-python/pull/42210))
 - Support AI Foundry by Handling GEN_AI_SYSTEM Attributes with [Spec](https://github.com/aep-health-and-standards/Telemetry-Collection-Spec/blob/main/ApplicationInsights/genai_semconv_mapping.md) ([#41705](https://github.com/Azure/azure-sdk-for-python/pull/41705))
 - Distinguish Azure AI SDKs in statsbeats ([#42016](https://github.com/Azure/azure-sdk-for-python/pull/42016))
 

sdk/monitor/azure-monitor-opentelemetry-exporter/setup.py

@@ -59,7 +59,6 @@
         "Development Status :: 4 - Beta",
         "Programming Language :: Python",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
@@ -87,8 +86,8 @@
         "azure-identity~=1.17",
         "fixedint==0.1.6",
         "msrest>=0.6.10",
-        "opentelemetry-api~=1.26",
-        "opentelemetry-sdk~=1.26",
+        "opentelemetry-api~=1.35",
+        "opentelemetry-sdk~=1.35",
         "psutil>=5.9,<8",
     ],
     entry_points={