Managed identities for Azure resources is the new name for the service formerly known as Managed Service Identity (MSI).
Managed identities is an alternative way to authorize in Azure Packer. Managed identities for Azure resources are automatically managed by Azure and enable you to authenticate to services that support Azure AD authentication without needing to insert credentials into your buildfile. Navigate to managed identities azure resources overview to learn more about this feature.
This feature will be used when no subscription_id, client_id or
client_secret is set in your buildfile.