Support user assigned identities in Grafana monitor integrations

[Droppers]

It appears as if the Azure CLI AMG extension does not have support for user assigned identities, because with the following command I get the following error: "The Grafana instance does not have a managed identity.".

az grafana integrations monitor add --name amg-example --resource-group rg-grafana --monitor-name monitor-workspace-example --monitor-resource-group-name rg-monitor-workspace --skip-role-assignments

az grafana show output, replaced the guids with empty guids:

{
 ...,
  "identity": {
    "type": "UserAssigned",
    "userAssignedIdentities": {
      "/subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/rg-grafana/providers/Microsoft.ManagedIdentity/userAssignedIdentities/mi-amg-example": {
        "clientId": "00000000-0000-0000-0000-000000000000",
        "principalId": "00000000-0000-0000-0000-000000000000"
      }
    }
  },
  ...
}

azure-cli-extensions/src/amg/azext_amg/integrations.py

Lines 24 to 26 in 682e555

	principal_id = grafana.identity.principal_id
	if not principal_id:
	raise ArgumentUsageError("The Grafana instance does not have a managed identity.")

[yonzhan]

Thank you for opening this issue, we will look into it.