Revert "Select histogram aggregation with environment variables"

This reverts commit fa1a167.

Author: ocelotl

CHANGELOG.md

@@ -7,8 +7,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
-- Enable selection of histogram aggregation via environment variable
-  ([#3265](https://github.com/open-telemetry/opentelemetry-python/pull/3265))
 - Move Protobuf encoding to its own package
   ([#3169](https://github.com/open-telemetry/opentelemetry-python/pull/3169))
 - Add experimental feature to detect resource detectors in auto instrumentation

opentelemetry-sdk/src/opentelemetry/sdk/environment_variables.py

@@ -650,7 +650,7 @@
 The :envvar:`OTEL_METRICS_EXEMPLAR_FILTER` is the filter for which measurements can become Exemplars.
 """
 
-OTEL_EXPORTER_OTLP_METRICS_DEFAULT_HISTOGRAM_AGGREGATION = (
+_OTEL_EXPORTER_OTLP_METRICS_DEFAULT_HISTOGRAM_AGGREGATION = (
     "OTEL_EXPORTER_OTLP_METRICS_DEFAULT_HISTOGRAM_AGGREGATION"
 )
 """

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

@@ -19,7 +19,6 @@
 from enum import IntEnum
 from logging import getLogger
 from math import inf
-from os import environ
 from threading import Lock
 from typing import Generic, List, Optional, Sequence, TypeVar
 
@@ -34,9 +33,6 @@
     Synchronous,
     UpDownCounter,
 )
-from opentelemetry.sdk.environment_variables import (
-    OTEL_EXPORTER_OTLP_METRICS_DEFAULT_HISTOGRAM_AGGREGATION,
-)
 from opentelemetry.sdk.metrics._internal.exponential_histogram.buckets import (
     Buckets,
 )
@@ -931,29 +927,6 @@ def _create_aggregation(
             )
 
         if isinstance(instrument, Histogram):
-
-            histogram_type = environ.get(
-                OTEL_EXPORTER_OTLP_METRICS_DEFAULT_HISTOGRAM_AGGREGATION,
-                "explicit_bucket_histogram",
-            )
-
-            if histogram_type == "base2_exponential_bucket_histogram":
-
-                return _ExponentialBucketHistogramAggregation(
-                    attributes, start_time_unix_nano
-                )
-
-            if histogram_type != "explicit_bucket_histogram":
-
-                _logger.warning(
-                    (
-                        "Invalid value for %s: %s, using explicit bucket "
-                        "histogram aggregation"
-                    ),
-                    OTEL_EXPORTER_OTLP_METRICS_DEFAULT_HISTOGRAM_AGGREGATION,
-                    histogram_type,
-                )
-
             return _ExplicitBucketHistogramAggregation(
                 attributes, start_time_unix_nano
             )

opentelemetry-sdk/tests/metrics/test_aggregation.py

@@ -12,21 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from logging import WARNING
 from math import inf
-from os import environ
 from time import sleep
 from typing import Union
 from unittest import TestCase
-from unittest.mock import Mock, patch
+from unittest.mock import Mock
 
-from opentelemetry.metrics import Histogram
-from opentelemetry.sdk.environment_variables import (
-    OTEL_EXPORTER_OTLP_METRICS_DEFAULT_HISTOGRAM_AGGREGATION,
-)
 from opentelemetry.sdk.metrics._internal.aggregation import (
     _ExplicitBucketHistogramAggregation,
-    _ExponentialBucketHistogramAggregation,
     _LastValueAggregation,
     _SumAggregation,
 )
@@ -548,60 +541,3 @@ def test_observable_gauge(self):
             0,
         )
         self.assertIsInstance(aggregation, _LastValueAggregation)
-
-    def test_exponential_explicit_bucket_histogram(self):
-
-        histogram = Mock(spec=Histogram)
-        default_aggregation = DefaultAggregation()
-
-        self.assertIsInstance(
-            default_aggregation._create_aggregation(histogram, Mock(), Mock()),
-            _ExplicitBucketHistogramAggregation,
-        )
-
-        with patch.dict(
-            environ,
-            {
-                OTEL_EXPORTER_OTLP_METRICS_DEFAULT_HISTOGRAM_AGGREGATION: "base2_exponential_bucket_histogram"
-            },
-        ):
-            self.assertIsInstance(
-                default_aggregation._create_aggregation(
-                    histogram, Mock(), Mock()
-                ),
-                _ExponentialBucketHistogramAggregation,
-            )
-
-        with patch.dict(
-            environ,
-            {OTEL_EXPORTER_OTLP_METRICS_DEFAULT_HISTOGRAM_AGGREGATION: "abc"},
-        ):
-            with self.assertLogs(level=WARNING) as log:
-                self.assertIsInstance(
-                    default_aggregation._create_aggregation(
-                        histogram, Mock(), Mock()
-                    ),
-                    _ExplicitBucketHistogramAggregation,
-                )
-            self.assertEqual(
-                log.output[0],
-                (
-                    "WARNING:opentelemetry.sdk.metrics._internal.aggregation:"
-                    "Invalid value for OTEL_EXPORTER_OTLP_METRICS_DEFAULT_"
-                    "HISTOGRAM_AGGREGATION: abc, using explicit bucket "
-                    "histogram aggregation"
-                ),
-            )
-
-        with patch.dict(
-            environ,
-            {
-                OTEL_EXPORTER_OTLP_METRICS_DEFAULT_HISTOGRAM_AGGREGATION: "explicit_bucket_histogram"
-            },
-        ):
-            self.assertIsInstance(
-                default_aggregation._create_aggregation(
-                    histogram, Mock(), Mock()
-                ),
-                _ExplicitBucketHistogramAggregation,
-            )