Disconnect gRPC client stub when shutting down OTLPSpanExporter

CHANGELOG.md

@@ -11,6 +11,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   ([#4364](https://github.com/open-telemetry/opentelemetry-python/pull/4364))
 - Add Python 3.13 support
   ([#4353](https://github.com/open-telemetry/opentelemetry-python/pull/4353))
+- Disconnect gRPC client stub when shutting down `OTLPSpanExporter`
+  ([#4370](https://github.com/open-telemetry/opentelemetry-python/pull/4370))
 
 ## Version 1.29.0/0.50b0 (2024-12-11)
 

exporter/opentelemetry-exporter-otlp-proto-grpc/src/opentelemetry/exporter/otlp/proto/grpc/exporter.py

@@ -360,6 +360,7 @@ def shutdown(self, timeout_millis: float = 30_000, **kwargs) -> None:
         # wait for the last export if any
         self._export_lock.acquire(timeout=timeout_millis / 1e3)
         self._shutdown = True
+        self._client = None
         self._export_lock.release()
 
     @property