Only use generic variable when instrumentation-specific is not set

util/opentelemetry-util-http/src/opentelemetry/util/http/__init__.py

@@ -49,11 +49,12 @@ def get_traced_request_attrs(instrumentation):
 
 
 def get_excluded_urls(instrumentation: str) -> ExcludeList:
+    # Get instrumentation-specific excluded URLs. If not set, retrieve them
+    # from generic variable.
     excluded_urls = environ.get(
-        _root.format(f"{instrumentation}_EXCLUDED_URLS"), ""
+        _root.format(f"{instrumentation}_EXCLUDED_URLS"),
+        environ.get(_root.format("EXCLUDED_URLS"), ""),
     )
-    if not excluded_urls:
-        excluded_urls = environ.get(_root.format("EXCLUDED_URLS"), "")
 
     return parse_excluded_urls(excluded_urls)
 

util/opentelemetry-util-http/tests/test_http_excluded_urls.py

@@ -0,0 +1,72 @@
+# Copyright The OpenTelemetry Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from unittest.mock import patch
+
+from opentelemetry.test.test_base import TestBase
+from opentelemetry.util.http import get_excluded_urls
+
+
+class TestGetExcludedUrls(TestBase):
+    @patch.dict(
+        "os.environ",
+        {
+            "OTEL_PYTHON_DJANGO_EXCLUDED_URLS": "excluded_arg/123,excluded_noarg"
+        },
+    )
+    def test_config_from_instrumentation_env(self):
+        exclude_list = get_excluded_urls("DJANGO")
+
+        self.assertTrue(exclude_list.url_disabled("/excluded_arg/123"))
+        self.assertTrue(exclude_list.url_disabled("/excluded_noarg"))
+        self.assertFalse(exclude_list.url_disabled("/excluded_arg/125"))
+
+    @patch.dict(
+        "os.environ",
+        {"OTEL_PYTHON_EXCLUDED_URLS": "excluded_arg/123,excluded_noarg"},
+    )
+    def test_config_from_generic_env(self):
+        exclude_list = get_excluded_urls("DJANGO")
+
+        self.assertTrue(exclude_list.url_disabled("/excluded_arg/123"))
+        self.assertTrue(exclude_list.url_disabled("/excluded_noarg"))
+        self.assertFalse(exclude_list.url_disabled("/excluded_arg/125"))
+
+    @patch.dict(
+        "os.environ",
+        {
+            "OTEL_PYTHON_DJANGO_EXCLUDED_URLS": "excluded_arg/123,excluded_noarg",
+            "OTEL_PYTHON_EXCLUDED_URLS": "excluded_arg/125",
+        },
+    )
+    def test_config_from_instrumentation_env_takes_precedence(self):
+        exclude_list = get_excluded_urls("DJANGO")
+
+        self.assertTrue(exclude_list.url_disabled("/excluded_arg/123"))
+        self.assertTrue(exclude_list.url_disabled("/excluded_noarg"))
+        self.assertFalse(exclude_list.url_disabled("/excluded_arg/125"))
+
+    @patch.dict(
+        "os.environ",
+        {
+            "OTEL_PYTHON_DJANGO_EXCLUDED_URLS": "",
+            "OTEL_PYTHON_EXCLUDED_URLS": "excluded_arg/125",
+        },
+    )
+    def test_config_from_instrumentation_env_empty(self):
+        exclude_list = get_excluded_urls("DJANGO")
+
+        self.assertFalse(exclude_list.url_disabled("/excluded_arg/123"))
+        self.assertFalse(exclude_list.url_disabled("/excluded_noarg"))
+        self.assertFalse(exclude_list.url_disabled("/excluded_arg/125"))