Azure Management - Policy Insights

Common errors

• AttributeError: 'DefaultAzureCredential' object has no attribute 'signed_session'

  cause This error typically occurs due to an incompatibility between an older version of `azure-identity` and a newer version of an Azure management library, or vice-versa, specifically related to how credentials handle HTTP sessions. `azure-mgmt-policyinsights` version 1.0.0 and later rely on the revamped `azure-identity` credential system.
  fix Ensure that `azure-identity` is updated to a compatible version (e.g., 1.5.0 or later, as seen in related issues) with `azure-mgmt-policyinsights` 1.0.0. The standard practice is to use `pip install --upgrade azure-identity azure-mgmt-policyinsights`.

• ModuleNotFoundError: No module named 'azure.mgmt.policyinsights.policy_insights_client'

  cause With the release of `azure-mgmt-policyinsights` 1.0.0 and similar versions, the package underwent a restructuring. The `PolicyInsightsClient` class, along with models and operations, is now directly importable from the top-level `azure.mgmt.policyinsights` package, deprecating imports from sub-modules like `policy_insights_client` or `models` for the client itself.
  fix Update your import statements. Instead of importing from a submodule, import `PolicyInsightsClient` directly from the main package: `from azure.mgmt.policyinsights import PolicyInsightsClient`.

• The resource provider 'Microsoft.PolicyInsights' is not registered in subscription '{subId}'

  cause Before you can use Azure Policy or Policy Insights, the `Microsoft.PolicyInsights` resource provider must be registered in the Azure subscription you are trying to query or manage. If it's not registered, the Azure SDK cannot interact with the service.
  fix Register the `Microsoft.PolicyInsights` resource provider using the Azure CLI (`az provider register --namespace Microsoft.PolicyInsights`), Azure PowerShell (`Register-AzResourceProvider -ProviderNamespace Microsoft.PolicyInsights`), or directly through the Azure portal.

• ResourceTypeNotSupported Message: Unsupported resource type: 'Microsoft.PolicyInsights/policyStates/queryResults'

  cause This error typically occurs when attempting to query policy states or events with an incorrect API version, an invalid resource path, or an unsupported query type for the specific API endpoint. This can also be an issue with pagination logic or when the backend service itself returns an unexpected error.
  fix Verify that the API version used in your client initialization (if explicitly set) or in direct REST calls is current and supported. Double-check the exact method signature and parameters for `PolicyStatesOperations` (e.g., `list_query_results_for_management_group`, `list_query_results_for_subscription`) and ensure the `policy_states_resource` parameter (like `PolicyStatesResource.DEFAULT` or `PolicyStatesResource.LATEST`) is correctly provided and compatible with the target scope. Ensure all required parameters like `subscription_id` or `management_group_name` are correctly passed.

Warnings

• gotcha Authentication and Permissions: Ensure your environment is set up for DefaultAzureCredential (e.g., `az login`, environment variables like AZURE_CLIENT_ID, AZURE_CLIENT_SECRET, AZURE_TENANT_ID) and the authenticated identity has the necessary Azure RBAC permissions (e.g., 'Reader' or 'Policy Insights Data Reader' role at the subscription/resource group scope) to query policy data. Authorization errors (401/403) are common if permissions are missing.
  Fix: Authenticate via `az login` or configure environment variables for service principal. Assign appropriate RBAC roles via Azure portal or Azure CLI (e.g., `az role assignment create --role "Reader" --scope /subscriptions/<sub-id> --assignee <user-or-sp-id>`).
• gotcha Policy Insights vs. Policy Management: This library (`azure-mgmt-policyinsights`) is strictly for *querying* policy states, events, and remediation. It is NOT for *defining* or *assigning* Azure Policies. For policy definition and assignment, use `azure-mgmt-policy`.
  Fix: Use `azure-mgmt-policy` for creating, updating, or deleting policy definitions, sets, and assignments.
• gotcha Correct Scope for Queries: All policy insights queries (e.g., `list_query_results_for_subscription`, `list_query_results_for_resource_group`) require a correctly formatted 'scope' parameter. Common mistakes include malformed scope strings or attempting to query a scope for which the authenticated identity lacks permissions.
  Fix: Ensure the `scope` parameter follows Azure Resource Manager ID format (e.g., `/subscriptions/{subscription_id}`, `/subscriptions/{subscription_id}/resourceGroups/{resource_group_name}`). Verify permissions for the specified scope.
• breaking The `azure-mgmt-policyinsights` library, or one of its dependencies, requires the `six` compatibility library. A `ModuleNotFoundError` indicates that `six` was not found, preventing the library from being imported and used.
  Fix: Ensure `six` is installed in your environment. You can explicitly install it by running `pip install six`. While `six` is typically installed automatically as a dependency of `azure-mgmt-policyinsights`, it might be missing in some specific environments or installation setups.
• gotcha Missing Dependency: The `azure-mgmt-policyinsights` library requires the `six` package. This error occurs if `six` is not installed in your Python environment, preventing the library from being imported.
  Fix: Install the missing `six` package using pip: `pip install six`. Ensure all required dependencies are installed, especially in minimal or custom environments.

Install

• pip install azure-mgmt-policyinsights azure-identity Install with identity for authentication

Imports

• PolicyInsightsClient

  from azure.mgmt.policyinsights import PolicyInsightsClient

• DefaultAzureCredential

  from azure.identity import DefaultAzureCredential

  Standard way to authenticate with Azure services.

Quickstart

Initializes the PolicyInsightsClient using DefaultAzureCredential and attempts to list the first policy event for the given subscription scope. This demonstrates client setup and a basic API interaction.

import os
from azure.identity import DefaultAzureCredential
from azure.mgmt.policyinsights import PolicyInsightsClient

# Get subscription ID from environment variable
# Ensure AZURE_SUBSCRIPTION_ID is set, e.g., in your shell or .env file.
subscription_id = os.environ.get("AZURE_SUBSCRIPTION_ID", "YOUR_SUBSCRIPTION_ID")

if subscription_id == "YOUR_SUBSCRIPTION_ID":
    print("WARNING: Please set the AZURE_SUBSCRIPTION_ID environment variable for actual API calls.")
    print("Using a dummy subscription ID for client initialization. API calls will likely fail.")
    subscription_id = "00000000-0000-0000-0000-000000000000"

try:
    # Authenticate using DefaultAzureCredential
    # This tries various methods: environment variables, managed identity, Azure CLI, etc.
    credential = DefaultAzureCredential()

    # Create a PolicyInsights client
    client = PolicyInsightsClient(credential, subscription_id)
    print(f"\nPolicyInsightsClient initialized for subscription: {subscription_id}")

    # Example: Attempt to list a few policy events
    # For actual data, you would typically add more filters (e.g., by time, resource).
    print("\nAttempting to list first few policy events (may require permissions and valid subscription ID)...\n")
    events_iterator = client.policy_events.list_query_results_for_subscription(
        scope=f"/subscriptions/{subscription_id}",
        policy_events_resource="latest",
        top=1 # Limit to 1 for quickstart output
    )

    found_event = False
    for event in events_iterator:
        print(f"  Policy Assignment ID: {event.policy_assignment_id}")
        print(f"  Policy Definition ID: {event.policy_definition_id}")
        print(f"  Resource ID: {event.resource_id}")
        found_event = True
        break # Only show the first one

    if not found_event:
        print("  No policy events found or unable to retrieve. Check your AZURE_SUBSCRIPTION_ID and Azure RBAC permissions.")

except Exception as e:
    print(f"\nAn error occurred during client initialization or API call: {e}")
    print("Please ensure you have authenticated with Azure (e.g., `az login` or environment variables) and have the necessary permissions (e.g., 'Reader' role).")