fix: export ExponentialBucketHistogramAggregation from opentelemetry.sdk.metrics.view (#3240)

* fix: export ExponentialBucketHistogramAggregation from opentelemetry.sdk.metrics.view

Without this PR if one wants to use exponential histrograms, which were added in realease 1.17.0 (https://github.com/open-telemetry/opentelemetry-python/blob/main/CHANGELOG.md#version-1170038b0-2023-03-22), one needs to import it from the private package opentelemetry.sdk.metrics._internal.aggregation.

This PR fixes #3239.

Author: sk-

CHANGELOG.md

@@ -6,6 +6,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## Unreleased
+- Fix exporting of ExponentialBucketHistogramAggregation from opentelemetry.sdk.metrics.view
+  ([#3240](https://github.com/open-telemetry/opentelemetry-python/pull/3240))
 
 - Fix headers types mismatch for OTLP Exporters
   ([#3226](https://github.com/open-telemetry/opentelemetry-python/pull/3226))

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

@@ -17,6 +17,7 @@
     DefaultAggregation,
     DropAggregation,
     ExplicitBucketHistogramAggregation,
+    ExponentialBucketHistogramAggregation,
     LastValueAggregation,
     SumAggregation,
 )
@@ -27,6 +28,7 @@
     "DefaultAggregation",
     "DropAggregation",
     "ExplicitBucketHistogramAggregation",
+    "ExponentialBucketHistogramAggregation",
     "LastValueAggregation",
     "SumAggregation",
     "View",