More trivial typing for sdk

Author: xrmx

opentelemetry-sdk/src/opentelemetry/sdk/trace/__init__.py

@@ -112,6 +112,7 @@ def on_start(
             span: The :class:`opentelemetry.trace.Span` that just started.
             parent_context: The parent context of the span that just started.
         """
+        ...
 
     def on_end(self, span: "ReadableSpan") -> None:
         """Called when a :class:`opentelemetry.trace.Span` is ended.
@@ -122,9 +123,11 @@ def on_end(self, span: "ReadableSpan") -> None:
         Args:
             span: The :class:`opentelemetry.trace.Span` that just ended.
         """
+        ...
 
     def shutdown(self) -> None:
         """Called when a :class:`opentelemetry.sdk.trace.TracerProvider` is shutdown."""
+        ...
 
     def force_flush(self, timeout_millis: int = 30000) -> bool:
         """Export all ended spans to the configured Exporter that have not yet
@@ -137,6 +140,7 @@ def force_flush(self, timeout_millis: int = 30000) -> bool:
         Returns:
             False if the timeout is exceeded, True otherwise.
         """
+        ...
 
 
 # Temporary fix until https://github.com/PyCQA/pylint/issues/4098 is resolved
@@ -273,7 +277,7 @@ def force_flush(self, timeout_millis: int = 30000) -> bool:
             timeout, False otherwise.
         """
         futures = []
-        for sp in self._span_processors:  # type: SpanProcessor
+        for sp in self._span_processors:
             future = self._executor.submit(sp.force_flush, timeout_millis)
             futures.append(future)