Add changelog and remove some unused imports..

Author: DylanRussell

CHANGELOG.md

@@ -10,6 +10,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Refactor `BatchLogRecordProcessor` to simplify code and make the control flow more
   clear ([#4562](https://github.com/open-telemetry/opentelemetry-python/pull/4562/)
   and [#4535](https://github.com/open-telemetry/opentelemetry-python/pull/4535)).
+- Update OTLP gRPC/HTTP exporters: the export timeout is now inclusive of all retries and backoffs,
+  and an unnecessary 32 second sleep that occured after all retries had completed/failed was removed
+  ([#4564](https://github.com/open-telemetry/opentelemetry-python/pull/4564)).
 
 
 ## Version 1.33.0/0.54b0 (2025-05-09)

exporter/opentelemetry-exporter-otlp-proto-common/src/opentelemetry/exporter/otlp/proto/common/_internal/__init__.py

@@ -17,12 +17,10 @@
 
 import logging
 from collections.abc import Sequence
-from itertools import count
 from typing import (
     Any,
     Callable,
     Dict,
-    Iterator,
     List,
     Mapping,
     Optional,