temporality (Azure#26924)

Author: lzchen

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

@@ -6,6 +6,8 @@
 
 - Add validation logic to ApplicationInsightsSampler
     ([#26546](https://github.com/Azure/azure-sdk-for-python/pull/26546))
+- Change default temporality of metrics to follow OTLP
+    ([#26546](https://github.com/Azure/azure-sdk-for-python/pull/26546))
 
 ### Breaking Changes
 

sdk/monitor/azure-monitor-opentelemetry-exporter/azure/monitor/opentelemetry/exporter/export/metrics/_exporter.py

@@ -4,7 +4,16 @@
 
 from typing import Optional, Any
 
+from opentelemetry.sdk.metrics import (
+    Counter,
+    Histogram,
+    ObservableCounter,
+    ObservableGauge,
+    ObservableUpDownCounter,
+    UpDownCounter,
+)
 from opentelemetry.sdk.metrics.export import (
+    AggregationTemporality,
     DataPointT,
     HistogramDataPoint,
     MetricExporter,
@@ -32,14 +41,24 @@
 __all__ = ["AzureMonitorMetricExporter"]
 
 
+APPLICATION_INSIGHTS_METRIC_TEMPORALITIES = {
+    Counter: AggregationTemporality.DELTA,
+    Histogram: AggregationTemporality.DELTA,
+    ObservableCounter: AggregationTemporality.DELTA,
+    ObservableGauge: AggregationTemporality.CUMULATIVE,
+    ObservableUpDownCounter: AggregationTemporality.CUMULATIVE,
+    UpDownCounter: AggregationTemporality.CUMULATIVE,
+}
+
+
 class AzureMonitorMetricExporter(BaseExporter, MetricExporter):
     """Azure Monitor Metric exporter for OpenTelemetry."""
 
     def __init__(self, **kwargs: Any) -> None:
         BaseExporter.__init__(self, **kwargs)
         MetricExporter.__init__(
             self,
-            preferred_temporality=kwargs.get("preferred_temporality"),
+            preferred_temporality=APPLICATION_INSIGHTS_METRIC_TEMPORALITIES,
             preferred_aggregation=kwargs.get("preferred_aggregation"),
         )