otlp-http-exporter: set default value for param timeout_sec in _export method

CHANGELOG.md

@@ -10,6 +10,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Overwrite logging.config.fileConfig and logging.config.dictConfig to ensure
 the OTLP `LogHandler` remains attached to the root logger. Fix a bug that
 can cause a deadlock to occur over `logging._lock` in some cases ([#4636](https://github.com/open-telemetry/opentelemetry-python/pull/4636)).
+- otlp-http-exporter: set default value for param `timeout_sec` in `_export` method
+  ([#4690](https://github.com/open-telemetry/opentelemetry-python/pull/4690))
 
 ## Version 1.35.0/0.56b0 (2025-07-11)
 
@@ -31,7 +33,7 @@ can cause a deadlock to occur over `logging._lock` in some cases ([#4636](https:
 - Update logger level to NOTSET in logs example
   ([#4637](https://github.com/open-telemetry/opentelemetry-python/pull/4637))
 - Logging API accepts optional `context`; deprecates `trace_id`, `span_id`, `trace_flags`.
-  ([#4597](https://github.com/open-telemetry/opentelemetry-python/pull/4597)) and 
+  ([#4597](https://github.com/open-telemetry/opentelemetry-python/pull/4597)) and
   ([#4668](https://github.com/open-telemetry/opentelemetry-python/pull/4668))
 - sdk: use context instead of trace_id,span_id for initializing LogRecord
   ([#4653](https://github.com/open-telemetry/opentelemetry-python/pull/4653))

exporter/opentelemetry-exporter-otlp-proto-http/src/opentelemetry/exporter/otlp/proto/http/_log_exporter/__init__.py

@@ -124,7 +124,9 @@ def __init__(
             )
         self._shutdown = False
 
-    def _export(self, serialized_data: bytes, timeout_sec: float):
+    def _export(
+        self, serialized_data: bytes, timeout_sec: Optional[float] = None
+    ):
         data = serialized_data
         if self._compression == Compression.Gzip:
             gzip_data = BytesIO()
@@ -134,6 +136,9 @@ def _export(self, serialized_data: bytes, timeout_sec: float):
         elif self._compression == Compression.Deflate:
             data = zlib.compress(serialized_data)
 
+        if timeout_sec is None:
+            timeout_sec = self._timeout
+
         # By default, keep-alive is enabled in Session's request
         # headers. Backends may choose to close the connection
         # while a post happens which causes an unhandled

exporter/opentelemetry-exporter-otlp-proto-http/src/opentelemetry/exporter/otlp/proto/http/metric_exporter/__init__.py

@@ -170,7 +170,9 @@ def __init__(
         )
         self._shutdown = False
 
-    def _export(self, serialized_data: bytes, timeout_sec: float):
+    def _export(
+        self, serialized_data: bytes, timeout_sec: Optional[float] = None
+    ):
         data = serialized_data
         if self._compression == Compression.Gzip:
             gzip_data = BytesIO()
@@ -180,6 +182,9 @@ def _export(self, serialized_data: bytes, timeout_sec: float):
         elif self._compression == Compression.Deflate:
             data = zlib.compress(serialized_data)
 
+        if timeout_sec is None:
+            timeout_sec = self._timeout
+
         # By default, keep-alive is enabled in Session's request
         # headers. Backends may choose to close the connection
         # while a post happens which causes an unhandled

exporter/opentelemetry-exporter-otlp-proto-http/src/opentelemetry/exporter/otlp/proto/http/trace_exporter/__init__.py

@@ -122,7 +122,9 @@ def __init__(
             )
         self._shutdown = False
 
-    def _export(self, serialized_data: bytes, timeout_sec: float):
+    def _export(
+        self, serialized_data: bytes, timeout_sec: Optional[float] = None
+    ):
         data = serialized_data
         if self._compression == Compression.Gzip:
             gzip_data = BytesIO()
@@ -132,6 +134,9 @@ def _export(self, serialized_data: bytes, timeout_sec: float):
         elif self._compression == Compression.Deflate:
             data = zlib.compress(serialized_data)
 
+        if timeout_sec is None:
+            timeout_sec = self._timeout
+
         # By default, keep-alive is enabled in Session's request
         # headers. Backends may choose to close the connection
         # while a post happens which causes an unhandled