Fix typing for collect

ocelotl · ocelotl · commit 6f04ff862d75 · 2023-09-06T16:23:56.000+02:00
diff --git a/opentelemetry-sdk/src/opentelemetry/sdk/metrics/_internal/measurement_consumer.py b/opentelemetry-sdk/src/opentelemetry/sdk/metrics/_internal/measurement_consumer.py
@@ -51,7 +51,7 @@ def collect(
         self,
         metric_reader: "opentelemetry.sdk.metrics.MetricReader",
         timeout_millis: float = 10_000,
-    ) -> Iterable[Metric]:
+    ) -> Optional[Iterable[Metric]]:
         pass
 
 
