docs(metrics): reference PeriodicExportingMetricReader usage with push exporters

opentelemetry-sdk/src/opentelemetry/sdk/metrics/_internal/__init__.py

@@ -377,8 +377,8 @@ class MeterProvider(APIMeterProvider):
         metric_readers: Register metric readers to collect metrics from the SDK
             on demand. Each :class:`opentelemetry.sdk.metrics.export.MetricReader` is
             completely independent and will collect separate streams of
-            metrics. TODO: reference ``PeriodicExportingMetricReader`` usage with push
-            exporters here.
+            metrics. For push-based export, use
+            :class:`opentelemetry.sdk.metrics.export.PeriodicExportingMetricReader`.
         resource: The resource representing what the metrics emitted from the SDK pertain to.
         shutdown_on_exit: If true, registers an `atexit` handler to call
             `MeterProvider.shutdown`
@@ -400,6 +400,18 @@ class MeterProvider(APIMeterProvider):
             ],
             # ...
         )
+
+    .. code-block:: python
+        :caption: Push-based export with PeriodicExportingMetricReader
+
+        from opentelemetry.sdk.metrics import MeterProvider
+        from opentelemetry.sdk.metrics.export import (
+            ConsoleMetricExporter,
+            PeriodicExportingMetricReader,
+        )
+
+        reader = PeriodicExportingMetricReader(ConsoleMetricExporter())
+        provider = MeterProvider(metric_readers=[reader])
     """
 
     _all_metric_readers_lock = Lock()