Implement functions resource detector (open-telemetry#2523)

* Update .pylintrc

* fn

* Update CHANGELOG.md

* commments

* Add deployment.environment to functions detector

* Revert "Add deployment.environment to functions detector"

This reverts commit 5411759.

* Remove deployment.environment from readme

* Release 0.1.5

---------

Co-authored-by: jeremydvoss <jerevoss@gmail.com>

resource/opentelemetry-resource-detector-azure/CHANGELOG.md

@@ -5,10 +5,12 @@ All notable changes to this project will be documented in this file.
 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
+## Version 0.1.5 (2024-05-16)
 
 - Ignore vm detector if already in other rps
   ([#2456](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/2456))
+- Implement functions resource detector
+  ([#2523](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/2523))
 
 ## Version 0.1.4 (2024-04-05)
 

resource/opentelemetry-resource-detector-azure/README.rst

@@ -60,7 +60,17 @@ The Azure App Service Resource Detector sets the following Resource Attributes:
  * ``service.instance.id`` set to the value of the ``WEBSITE_INSTANCE_ID`` environment variable.
  * ``azure.app.service.stamp`` set to the value of the ``WEBSITE_HOME_STAMPNAME`` environment variable.
 
-The Azure VM Resource Detector sets the following Resource Attributes according to the response from the `Azure Metadata Service <https://learn.microsoft.com/en-us/azure/virtual-machines/instance-metadata-service?tabs=windows>`_:
+ The Azure Functions Resource Detector sets the following Resource Attributes:
+ * ``service.name`` set to the value of the ``WEBSITE_SITE_NAME`` environment variable.
+ * ``process.id`` set to the process ID collected from the running process.
+ * ``cloud.platform`` set to ``azure_functions``.
+ * ``cloud.provider`` set to ``azure``.
+ * ``cloud.resource_id`` set using the ``WEBSITE_RESOURCE_GROUP``, ``WEBSITE_OWNER_NAME``, and ``WEBSITE_SITE_NAME`` environment variables.
+ * ``cloud.region`` set to the value of the ``REGION_NAME`` environment variable.
+ * ``faas.instance`` set to the value of the ``WEBSITE_INSTANCE_ID`` environment variable.
+ * ``faas.max_memory`` set to the value of the ``WEBSITE_MEMORY_LIMIT_MB`` environment variable.
+
+The Azure VM Resource Detector sets the following Resource Attributes according to the response from the `Azure Metadata Service <https://learn.microsoft.com/azure/virtual-machines/instance-metadata-service?tabs=windows>`_:
  * ``azure.vm.scaleset.name`` set to the value of the ``vmScaleSetName`` field.
  * ``azure.vm.sku`` set to the value of the ``sku`` field.
  * ``cloud.platform`` set to the value of the ``azure_vm``.

resource/opentelemetry-resource-detector-azure/pyproject.toml

@@ -29,6 +29,7 @@ dependencies = [
 
 [project.entry-points.opentelemetry_resource_detector]
 azure_app_service = "opentelemetry.resource.detector.azure.app_service:AzureAppServiceResourceDetector"
+azure_functions = "opentelemetry.resource.detector.azure.functions:AzureFunctionsResourceDetector"
 azure_vm = "opentelemetry.resource.detector.azure.vm:AzureVMResourceDetector"
 
 [project.urls]

resource/opentelemetry-resource-detector-azure/src/opentelemetry/resource/detector/azure/__init__.py

@@ -15,11 +15,13 @@
 # pylint: disable=import-error
 
 from .app_service import AzureAppServiceResourceDetector
+from .functions import AzureFunctionsResourceDetector
 from .version import __version__
 from .vm import AzureVMResourceDetector
 
 __all__ = [
     "AzureAppServiceResourceDetector",
+    "AzureFunctionsResourceDetector",
     "AzureVMResourceDetector",
     "__version__",
 ]

resource/opentelemetry-resource-detector-azure/src/opentelemetry/resource/detector/azure/_constants.py

@@ -43,6 +43,12 @@
 # Functions
 
 _FUNCTIONS_WORKER_RUNTIME = "FUNCTIONS_WORKER_RUNTIME"
+_WEBSITE_MEMORY_LIMIT_MB = "WEBSITE_MEMORY_LIMIT_MB"
+
+_FUNCTIONS_ATTRIBUTE_ENV_VARS = {
+    ResourceAttributes.FAAS_INSTANCE: _WEBSITE_INSTANCE_ID,
+    ResourceAttributes.FAAS_MAX_MEMORY: _WEBSITE_MEMORY_LIMIT_MB,
+}
 
 # Vm
 

resource/opentelemetry-resource-detector-azure/src/opentelemetry/resource/detector/azure/_utils.py

@@ -11,27 +11,44 @@
 # 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.
-
-import os
+from os import environ
+from typing import Optional
 
 from ._constants import (
     _AKS_ARM_NAMESPACE_ID,
     _FUNCTIONS_WORKER_RUNTIME,
+    _WEBSITE_OWNER_NAME,
+    _WEBSITE_RESOURCE_GROUP,
     _WEBSITE_SITE_NAME,
 )
 
 
 def _is_on_aks() -> bool:
-    return os.environ.get(_AKS_ARM_NAMESPACE_ID) is not None
+    return environ.get(_AKS_ARM_NAMESPACE_ID) is not None
 
 
 def _is_on_app_service() -> bool:
-    return os.environ.get(_WEBSITE_SITE_NAME) is not None
+    return environ.get(_WEBSITE_SITE_NAME) is not None
 
 
 def _is_on_functions() -> bool:
-    return os.environ.get(_FUNCTIONS_WORKER_RUNTIME) is not None
+    return environ.get(_FUNCTIONS_WORKER_RUNTIME) is not None
 
 
 def _can_ignore_vm_detect() -> bool:
     return _is_on_aks() or _is_on_app_service() or _is_on_functions()
+
+
+def _get_azure_resource_uri() -> Optional[str]:
+    website_site_name = environ.get(_WEBSITE_SITE_NAME)
+    website_resource_group = environ.get(_WEBSITE_RESOURCE_GROUP)
+    website_owner_name = environ.get(_WEBSITE_OWNER_NAME)
+
+    subscription_id = website_owner_name
+    if website_owner_name and "+" in website_owner_name:
+        subscription_id = website_owner_name[0 : website_owner_name.index("+")]
+
+    if not (website_site_name and website_resource_group and subscription_id):
+        return None
+
+    return f"/subscriptions/{subscription_id}/resourceGroups/{website_resource_group}/providers/Microsoft.Web/sites/{website_site_name}"

resource/opentelemetry-resource-detector-azure/src/opentelemetry/resource/detector/azure/app_service.py

@@ -12,6 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+from typing import Optional
 from os import environ
 
 from opentelemetry.sdk.resources import Resource, ResourceDetector
@@ -20,29 +21,32 @@
     CloudProviderValues,
     ResourceAttributes,
 )
+from opentelemetry.resource.detector.azure._utils import _get_azure_resource_uri
 
 from ._constants import (
     _APP_SERVICE_ATTRIBUTE_ENV_VARS,
-    _WEBSITE_OWNER_NAME,
-    _WEBSITE_RESOURCE_GROUP,
     _WEBSITE_SITE_NAME,
 )
 
+from opentelemetry.resource.detector.azure._utils import _is_on_functions
+
 
 class AzureAppServiceResourceDetector(ResourceDetector):
     def detect(self) -> Resource:
         attributes = {}
         website_site_name = environ.get(_WEBSITE_SITE_NAME)
         if website_site_name:
-            attributes[ResourceAttributes.SERVICE_NAME] = website_site_name
+            # Functions resource detector takes priority with `service.name` and `cloud.platform`
+            if not _is_on_functions():
+                attributes[ResourceAttributes.SERVICE_NAME] = website_site_name
+                attributes[ResourceAttributes.CLOUD_PLATFORM] = (
+                    CloudPlatformValues.AZURE_APP_SERVICE.value
+                )
             attributes[ResourceAttributes.CLOUD_PROVIDER] = (
                 CloudProviderValues.AZURE.value
             )
-            attributes[ResourceAttributes.CLOUD_PLATFORM] = (
-                CloudPlatformValues.AZURE_APP_SERVICE.value
-            )
 
-            azure_resource_uri = _get_azure_resource_uri(website_site_name)
+            azure_resource_uri = _get_azure_resource_uri()
             if azure_resource_uri:
                 attributes[ResourceAttributes.CLOUD_RESOURCE_ID] = (
                     azure_resource_uri
@@ -53,17 +57,3 @@ def detect(self) -> Resource:
                     attributes[key] = value
 
         return Resource(attributes)
-
-
-def _get_azure_resource_uri(website_site_name):
-    website_resource_group = environ.get(_WEBSITE_RESOURCE_GROUP)
-    website_owner_name = environ.get(_WEBSITE_OWNER_NAME)
-
-    subscription_id = website_owner_name
-    if website_owner_name and "+" in website_owner_name:
-        subscription_id = website_owner_name[0 : website_owner_name.index("+")]
-
-    if not (website_resource_group and subscription_id):
-        return None
-
-    return f"/subscriptions/{subscription_id}/resourceGroups/{website_resource_group}/providers/Microsoft.Web/sites/{website_site_name}"

resource/opentelemetry-resource-detector-azure/src/opentelemetry/resource/detector/azure/functions.py

@@ -0,0 +1,68 @@
+# 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 os import environ, getpid
+
+from opentelemetry.sdk.resources import Resource, ResourceDetector
+from opentelemetry.semconv.resource import (
+    CloudPlatformValues,
+    CloudProviderValues,
+    ResourceAttributes,
+)
+
+from ._constants import (
+    _FUNCTIONS_ATTRIBUTE_ENV_VARS,
+    _REGION_NAME,
+    _WEBSITE_SITE_NAME,
+)
+from opentelemetry.resource.detector.azure._utils import (
+    _get_azure_resource_uri,
+    _is_on_functions,
+)
+
+
+class AzureFunctionsResourceDetector(ResourceDetector):
+    def detect(self) -> Resource:
+        attributes = {}
+        if _is_on_functions():
+            website_site_name = environ.get(_WEBSITE_SITE_NAME)
+            if website_site_name:
+                attributes[ResourceAttributes.SERVICE_NAME] = website_site_name
+            attributes[ResourceAttributes.PROCESS_PID] = getpid()
+            attributes[ResourceAttributes.CLOUD_PROVIDER] = (
+                CloudProviderValues.AZURE.value
+            )
+            attributes[ResourceAttributes.CLOUD_PLATFORM] = (
+                CloudPlatformValues.AZURE_FUNCTIONS.value
+            )
+            cloud_region = environ.get(_REGION_NAME)
+            if cloud_region:
+                attributes[ResourceAttributes.CLOUD_REGION] = cloud_region
+            azure_resource_uri = _get_azure_resource_uri()
+            if azure_resource_uri:
+                attributes[ResourceAttributes.CLOUD_RESOURCE_ID] = (
+                    azure_resource_uri
+                )
+            for key, env_var in _FUNCTIONS_ATTRIBUTE_ENV_VARS.items():
+                value = environ.get(env_var)
+                if value:
+                    if key == ResourceAttributes.FAAS_MAX_MEMORY:
+                        try:
+                            value = int(value)
+                        except ValueError:
+                            continue
+                    attributes[key] = value
+
+        return Resource(attributes)
+

resource/opentelemetry-resource-detector-azure/src/opentelemetry/resource/detector/azure/version.py

@@ -12,4 +12,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-__version__ = "0.1.4"
+__version__ = "0.1.5"

resource/opentelemetry-resource-detector-azure/tests/test_app_service.py

@@ -68,6 +68,45 @@ def test_on_app_service(self):
         self.assertEqual(
             attributes["azure.app.service.stamp"], TEST_WEBSITE_HOME_STAMPNAME
         )
+
+    @patch.dict(
+        "os.environ",
+        {
+            "FUNCTIONS_WORKER_RUNTIME": "1",
+            "WEBSITE_SITE_NAME": TEST_WEBSITE_SITE_NAME,
+            "REGION_NAME": TEST_REGION_NAME,
+            "WEBSITE_SLOT_NAME": TEST_WEBSITE_SLOT_NAME,
+            "WEBSITE_HOSTNAME": TEST_WEBSITE_HOSTNAME,
+            "WEBSITE_INSTANCE_ID": TEST_WEBSITE_INSTANCE_ID,
+            "WEBSITE_HOME_STAMPNAME": TEST_WEBSITE_HOME_STAMPNAME,
+            "WEBSITE_RESOURCE_GROUP": TEST_WEBSITE_RESOURCE_GROUP,
+            "WEBSITE_OWNER_NAME": TEST_WEBSITE_OWNER_NAME,
+        },
+        clear=True,
+    )
+    def test_on_app_service_with_functions(self):
+        resource = AzureAppServiceResourceDetector().detect()
+        attributes = resource.attributes
+        self.assertIsNone(attributes.get("service.name"))
+        self.assertEqual(attributes["cloud.provider"], "azure")
+        self.assertIsNone(attributes.get("cloud.platform"))
+
+        self.assertEqual(
+            attributes["cloud.resource_id"],
+            f"/subscriptions/{TEST_WEBSITE_OWNER_NAME}/resourceGroups/{TEST_WEBSITE_RESOURCE_GROUP}/providers/Microsoft.Web/sites/{TEST_WEBSITE_SITE_NAME}",
+        )
+
+        self.assertEqual(attributes["cloud.region"], TEST_REGION_NAME)
+        self.assertEqual(
+            attributes["deployment.environment"], TEST_WEBSITE_SLOT_NAME
+        )
+        self.assertEqual(attributes["host.id"], TEST_WEBSITE_HOSTNAME)
+        self.assertEqual(
+            attributes["service.instance.id"], TEST_WEBSITE_INSTANCE_ID
+        )
+        self.assertEqual(
+            attributes["azure.app.service.stamp"], TEST_WEBSITE_HOME_STAMPNAME
+        )
 
     @patch.dict(
         "os.environ",