remove OTEL_PYTHON_EXPERIMENTAL_DISABLE_PROMETHEUS_UNIT_NORMALIZATION from exporter-prometheus

Signed-off-by: emdneto <[email protected]>

Author: emdneto

CHANGELOG.md

@@ -17,6 +17,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   ([#4094](https://github.com/open-telemetry/opentelemetry-python/pull/4094))
 - Implement events sdk
   ([#4176](https://github.com/open-telemetry/opentelemetry-python/pull/4176))
+- Drop `OTEL_PYTHON_EXPERIMENTAL_DISABLE_PROMETHEUS_UNIT_NORMALIZATION`
+  environment variable
+  ([#4217](https://github.com/open-telemetry/opentelemetry-python/pull/4217))
 
 ## Version 1.27.0/0.48b0 (2024-08-28)
 

exporter/opentelemetry-exporter-prometheus/src/opentelemetry/exporter/prometheus/__init__.py

@@ -87,7 +87,6 @@
 from opentelemetry.sdk.environment_variables import (
     OTEL_EXPORTER_PROMETHEUS_HOST,
     OTEL_EXPORTER_PROMETHEUS_PORT,
-    OTEL_PYTHON_EXPERIMENTAL_DISABLE_PROMETHEUS_UNIT_NORMALIZATION,
 )
 from opentelemetry.sdk.metrics import Counter
 from opentelemetry.sdk.metrics import Histogram as HistogramInstrument
@@ -234,18 +233,7 @@ def _translate_to_prometheus(
 
             metric_description = metric.description or ""
 
-            # TODO(#3929): remove this opt-out option
-            disable_unit_normalization = (
-                environ.get(
-                    OTEL_PYTHON_EXPERIMENTAL_DISABLE_PROMETHEUS_UNIT_NORMALIZATION,
-                    "false",
-                ).lower()
-                == "true"
-            )
-            if disable_unit_normalization:
-                metric_unit = metric.unit
-            else:
-                metric_unit = map_unit(metric.unit)
+            metric_unit = map_unit(metric.unit)
 
             for number_data_point in metric.data.data_points:
                 label_keys = []

exporter/opentelemetry-exporter-prometheus/tests/test_prometheus_exporter.py

@@ -12,7 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from os import environ
 from textwrap import dedent
 from unittest import TestCase
 from unittest.mock import Mock, patch
@@ -28,9 +27,6 @@
     PrometheusMetricReader,
     _CustomCollector,
 )
-from opentelemetry.sdk.environment_variables import (
-    OTEL_PYTHON_EXPERIMENTAL_DISABLE_PROMETHEUS_UNIT_NORMALIZATION,
-)
 from opentelemetry.sdk.metrics import MeterProvider
 from opentelemetry.sdk.metrics.export import (
     AggregationTemporality,
@@ -551,25 +547,6 @@ def test_metric_name_with_unit(self):
             ),
         )
 
-    # TODO(#3929): remove this opt-out option
-    @patch.dict(
-        environ,
-        {
-            OTEL_PYTHON_EXPERIMENTAL_DISABLE_PROMETHEUS_UNIT_NORMALIZATION: "true"
-        },
-    )
-    def test_metric_name_with_unit_normalization_disabled(self):
-        self.verify_text_format(
-            _generate_sum(name="test_unit_not_normalized", value=1, unit="s"),
-            dedent(
-                """\
-                # HELP test_unit_not_normalized_s_total foo
-                # TYPE test_unit_not_normalized_s_total counter
-                test_unit_not_normalized_s_total{a="1",b="true"} 1.0
-                """
-            ),
-        )
-
     def test_semconv(self):
         """Tests that a few select semconv metrics get converted to the expected prometheus
         text format"""

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

@@ -780,21 +780,3 @@
 This is an experimental environment variable and the name of this variable and its behavior can
 change in a non-backwards compatible way.
 """
-
-
-# TODO(#3929): remove this opt-out option
-OTEL_PYTHON_EXPERIMENTAL_DISABLE_PROMETHEUS_UNIT_NORMALIZATION = (
-    "OTEL_PYTHON_EXPERIMENTAL_DISABLE_PROMETHEUS_UNIT_NORMALIZATION"
-)
-"""
-.. envvar:: OTEL_PYTHON_EXPERIMENTAL_DISABLE_PROMETHEUS_UNIT_NORMALIZATION
-
-The :envvar:`OTEL_PYTHON_EXPERIMENTAL_DISABLE_PROMETHEUS_UNIT_NORMALIZATION` environment
-variable allows you to opt-out of the unit normalization described `in the specification
-<https://github.com/open-telemetry/opentelemetry-specification/blob/v1.33.0/specification/compatibility/prometheus_and_openmetrics.md#metric-metadata-1>`_.
-
-Default: False
-
-This is an temporary environment variable that provides backward compatibility but will be
-removed in the future https://github.com/open-telemetry/opentelemetry-python/issues/3929.
-"""