Default resource detector env var and add auto-instrumentation resource detector

sdk/monitor/azure-monitor-opentelemetry/CHANGELOG.md

@@ -4,13 +4,13 @@
 
 ### Features Added
 
+- Default Resource Detector environment variable to allow for customization. Add App Service Resource Detector to Auto-Instrumentation.
+    ([#33340](https://github.com/Azure/azure-sdk-for-python/pull/XXXXX))
+
 ### Breaking Changes
 
 ### Bugs Fixed
 
-- Remove VM Resource Detector for hotfix
-    ([#33305](https://github.com/Azure/azure-sdk-for-python/pull/33305))
-
 ### Other Changes
 
 ## 1.1.0 (2023-11-08)

sdk/monitor/azure-monitor-opentelemetry/README.md

@@ -65,14 +65,15 @@ You can use `configure_azure_monitor` to set up instrumentation for your app to
 You can configure further with [OpenTelemetry environment variables][ot_env_vars] such as:
 | Environment Variable | Description |
 |-------------|----------------------|
-| [OTEL_SERVICE_NAME][opentelemetry_spec_service_name], [OTEL_RESOURCE_ATTRIBUTES][opentelemetry_spec_resource_attributes] | Specifies the OpenTelemetry [resource][opentelemetry_spec_resource] associated with your application. |
+| [OTEL_SERVICE_NAME][ot_spec_service_name], [OTEL_RESOURCE_ATTRIBUTES][ot_spec_resource_attributes] | Specifies the OpenTelemetry [resource][ot_spec_resource] associated with your application. |
 | `OTEL_LOGS_EXPORTER` | If set to `None`, disables collection and export of logging telemetry. |
 | `OTEL_METRICS_EXPORTER` | If set to `None`, disables collection and export of metric telemetry. |
 | `OTEL_TRACES_EXPORTER` | If set to `None`, disables collection and export of distributed tracing telemetry. |
 | `OTEL_BLRP_SCHEDULE_DELAY` | Specifies the logging export interval in milliseconds. Defaults to 5000. |
 | `OTEL_BSP_SCHEDULE_DELAY` | Specifies the distributed tracing export interval in milliseconds. Defaults to 5000. |
 | `OTEL_TRACES_SAMPLER_ARG` | Specifies the ratio of distributed tracing telemetry to be [sampled][application_insights_sampling]. Accepted values are in the range [0,1]. Defaults to 1.0, meaning no telemetry is sampled out. |
 | `OTEL_PYTHON_DISABLED_INSTRUMENTATIONS` | Specifies which of the supported instrumentations to disable. Disabled instrumentations will not be instrumented as part of `configure_azure_monitor`. However, they can still be manually instrumented with `instrument()` directly. Accepts a comma-separated list of lowercase [Library Names](#officially-supported-instrumentations). For example, set to `"psycopg2,fastapi"` to disable the Psycopg2 and FastAPI instrumentations. Defaults to an empty list, enabling all supported instrumentations. |
+| `OTEL_EXPERIMENTAL_RESOURCE_DETECTORS` | Specifies OpenTelemetry Resource Detectors to be used to generate Resource Attributes. Defaults to "azure_app_service,azure_vm" to enable the [Azure Resource Detectors][ot_resource_detector_azure] for Azure App Service and Azure VM. See the [OpenTelemetry Python Resource Detector Documentation][ot_python_resource_detectors] for more. |
 
 #### Azure monitor OpenTelemetry Exporter configurations
 
@@ -230,10 +231,12 @@ contact [opencode@microsoft.com](mailto:opencode@microsoft.com) with any additio
 [ot_instrumentation_urllib]: https://github.com/open-telemetry/opentelemetry-python-contrib/tree/main/instrumentation/opentelemetry-instrumentation-urllib3
 [ot_instrumentation_urllib3]: https://github.com/open-telemetry/opentelemetry-python-contrib/tree/main/instrumentation/opentelemetry-instrumentation-urllib3
 [ot_instrumentation_urllib3_version]: https://github.com/open-telemetry/opentelemetry-python-contrib/blob/main/instrumentation/opentelemetry-instrumentation-urllib3/src/opentelemetry/instrumentation/urllib3/package.py#L16
-[opentelemetry_spec_resource]: https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/resource/sdk.md#resource-sdk
-[opentelemetry_spec_resource_attributes]: https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/resource/sdk.md#specifying-resource-information-via-an-environment-variable
-[opentelemetry_spec_service_name]: https://github.com/open-telemetry/semantic-conventions/blob/main/docs/resource/README.md#service
-[opentelemetry_spec_view]: https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/sdk.md#view
+[ot_python_resource_detectors]: https://opentelemetry-python.readthedocs.io/en/latest/sdk/environment_variables.html#opentelemetry.sdk.environment_variables.OTEL_EXPERIMENTAL_RESOURCE_DETECTORS
+[ot_resource_detector_azure]: https://pypi.org/project/ot_resource_detector_azure/
+[ot_spec_resource]: https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/resource/sdk.md#resource-sdk
+[ot_spec_resource_attributes]: https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/resource/sdk.md#specifying-resource-information-via-an-environment-variable
+[ot_spec_service_name]: https://github.com/open-telemetry/semantic-conventions/blob/main/docs/resource/README.md#service
+[ot_spec_view]: https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/sdk.md#view
 [pip]: https://pypi.org/project/pip/
 [pypi_django]: https://pypi.org/project/Django/
 [pypi_fastapi]: https://pypi.org/project/fastapi/

sdk/monitor/azure-monitor-opentelemetry/azure/monitor/opentelemetry/_autoinstrumentation/distro.py

@@ -16,12 +16,14 @@
 )
 from opentelemetry.sdk.environment_variables import (
     _OTEL_PYTHON_LOGGING_AUTO_INSTRUMENTATION_ENABLED,
+    OTEL_EXPERIMENTAL_RESOURCE_DETECTORS,
 )
 
 from azure.core.settings import settings
 from azure.core.tracing.ext.opentelemetry_span import OpenTelemetrySpan
 from azure.monitor.opentelemetry._constants import (
     _is_attach_enabled,
+    _AZURE_APP_SERVICE_RESOURCE_DETECTOR_NAME,
     _AZURE_SDK_INSTRUMENTATION_NAME,
     _PREVIEW_ENTRY_POINT_WARNING,
 )
@@ -71,6 +73,9 @@ def _configure_auto_instrumentation() -> None:
     environ.setdefault(
         _OTEL_PYTHON_LOGGING_AUTO_INSTRUMENTATION_ENABLED, "true"
     )
+    environ.setdefault(
+        OTEL_EXPERIMENTAL_RESOURCE_DETECTORS, _AZURE_APP_SERVICE_RESOURCE_DETECTOR_NAME
+    )
     otel_disabled_instrumentations = _get_otel_disabled_instrumentations()
     if _AZURE_SDK_INSTRUMENTATION_NAME not in otel_disabled_instrumentations:
         settings.tracing_implementation = OpenTelemetrySpan

sdk/monitor/azure-monitor-opentelemetry/azure/monitor/opentelemetry/_configure.py

@@ -30,7 +30,9 @@
 from azure.core.tracing.ext.opentelemetry_span import OpenTelemetrySpan
 from azure.monitor.opentelemetry._constants import (
     _ALL_SUPPORTED_INSTRUMENTED_LIBRARIES,
+    _AZURE_APP_SERVICE_RESOURCE_DETECTOR_NAME,
     _AZURE_SDK_INSTRUMENTATION_NAME,
+    _AZURE_VM_RESOURCE_DETECTOR_NAME,
     DISABLE_LOGGING_ARG,
     DISABLE_METRICS_ARG,
     DISABLE_TRACING_ARG,
@@ -51,7 +53,8 @@
 
 
 _SUPPORTED_RESOURCE_DETECTORS = (
-    "azure_app_service",
+    _AZURE_APP_SERVICE_RESOURCE_DETECTOR_NAME,
+    _AZURE_VM_RESOURCE_DETECTOR_NAME,
 )
 
 _logger = getLogger(__name__)
@@ -101,11 +104,10 @@ def configure_azure_monitor(**kwargs) -> None:
     _setup_instrumentations(configurations)
 
 def _setup_resources():
-    detectors = os.environ.get(OTEL_EXPERIMENTAL_RESOURCE_DETECTORS, "")
-    if detectors:
-        detectors = detectors + ","
-    detectors += ",".join(_SUPPORTED_RESOURCE_DETECTORS)
-    os.environ[OTEL_EXPERIMENTAL_RESOURCE_DETECTORS] = detectors
+    os.environ.setdefault(
+        OTEL_EXPERIMENTAL_RESOURCE_DETECTORS,
+        ",".join(_SUPPORTED_RESOURCE_DETECTORS)
+    )
 
 
 def _setup_tracing(configurations: Dict[str, ConfigurationValue]):

sdk/monitor/azure-monitor-opentelemetry/azure/monitor/opentelemetry/_constants.py

@@ -97,3 +97,6 @@ def _env_var_or_default(var_name, default_val=""):
 
 def _is_attach_enabled():
     return isdir("/agents/python/")
+
+_AZURE_APP_SERVICE_RESOURCE_DETECTOR_NAME = "azure_app_service"
+_AZURE_VM_RESOURCE_DETECTOR_NAME = "azure_vm"

sdk/monitor/azure-monitor-opentelemetry/tests/configuration/test_configure.py

@@ -194,22 +194,28 @@ def test_configure_azure_monitor_disable_metrics(
         metrics_mock.assert_not_called()
         instrumentation_mock.assert_called_once_with(configurations)
 
-    @patch.dict("os.environ", {"OTEL_EXPERIMENTAL_RESOURCE_DETECTORS": ""})
+    @patch.dict("os.environ", {}, clear=True)
     def test_setup_resources(self):
         _setup_resources()
         self.assertEqual(
             os.environ["OTEL_EXPERIMENTAL_RESOURCE_DETECTORS"],
-            # TODO: Change back to "azure_app_service,azure_vm" after VM Resource Detector fix for https://github.com/Azure/azure-sdk-for-python/issues/33295
-            "azure_app_service"
+            "azure_app_service,azure_vm"
         )
 
     @patch.dict("os.environ", {"OTEL_EXPERIMENTAL_RESOURCE_DETECTORS": "test_detector"})
     def test_setup_resources_existing_detectors(self):
         _setup_resources()
         self.assertEqual(
             os.environ["OTEL_EXPERIMENTAL_RESOURCE_DETECTORS"],
-            # TODO: Change back to "azure_app_service,azure_vm" after VM Resource Detector fix for https://github.com/Azure/azure-sdk-for-python/issues/33295
-            "test_detector,azure_app_service"
+            "test_detector"
+        )
+
+    @patch.dict("os.environ", {"OTEL_EXPERIMENTAL_RESOURCE_DETECTORS": "test_detector,azure_vm"})
+    def test_setup_resources_existing_with_azure_detectors(self):
+        _setup_resources()
+        self.assertEqual(
+            os.environ["OTEL_EXPERIMENTAL_RESOURCE_DETECTORS"],
+            "test_detector,azure_vm"
         )
 
     @patch(