Add api files

Author: rads-1996

sdk/monitor/azure-monitor-opentelemetry-exporter/api.md

@@ -160,6 +160,14 @@ namespace azure.monitor.opentelemetry.exporter.statsbeat
 
         def __init__(self) -> None: ...
 
+        def add_additional_metric_callbacks(
+                self, 
+                metric_name: str, 
+                callback: Callable[[CallbackOptions], Iterable[Observation]]
+            ) -> None: ...
+
+        def get_additional_metric_callbacks(self, metric_name: str) -> Iterable[Callable[[CallbackOptions], Iterable[Observation]]]: ...
+
         def get_current_config(self) -> Optional[StatsbeatConfig]: ...
 
         def initialize(self, config: StatsbeatConfig) -> bool: ...

sdk/monitor/azure-monitor-opentelemetry-exporter/api.metadata.yml

@@ -1,3 +1,3 @@
-apiMdSha256: 4e626c08830ccebb3dab6dab00472543831b70bae5cd17f3bf1432d938991f5b
+apiMdSha256: e927f060406b601099194e0e8346efaed5f68fee04cc95eb441de90f67b1b3d6
 parserVersion: 0.3.28
 pythonVersion: 3.13.14