Update functions detector readme (#2533)

Author: jeremydvoss

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

@@ -9,6 +9,7 @@ OpenTelemetry Resource detectors for Azure
 This library contains OpenTelemetry `Resource Detectors <https://opentelemetry.io/docs/specs/otel/resource/sdk/#detecting-resource-information-from-the-environment>`_ for the following Azure resources:
  * `Azure App Service <https://azure.microsoft.com/en-us/products/app-service>`_
  * `Azure Virtual Machines <https://azure.microsoft.com/en-us/products/virtual-machines>`_
+ * `Azure Functions (Experimental) <https://azure.microsoft.com/en-us/products/functions>`_
 
 Installation
 ------------
@@ -60,16 +61,6 @@ 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 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.
@@ -84,6 +75,16 @@ The Azure VM Resource Detector sets the following Resource Attributes according
  * ``os.version`` set to the value of the ``version`` field.
  * ``service.instance.id`` set to the value of the ``vmId`` field.
 
+The Azure Functions Resource Detector is currently experimental. It 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.
+
 For more information, see the `Semantic Conventions for Cloud Resource Attributes <https://opentelemetry.io/docs/specs/otel/resource/semantic_conventions/cloud/>`_.
 
 References