def METHOD_NAME(instance_name: Optional[pulumi.Input[str]] = None,
                                resource_group_name: Optional[pulumi.Input[str]] = None,
                                opts: Optional[pulumi.InvokeOptions] = None) -> pulumi.Output[GetInstanceDetailsResult]:
    """
    Gets details about the specified instances.
    :param str instance_name: The name of the instance. It must be a minimum of 3 characters, and a maximum of 63.
    :param str resource_group_name: The name of the Azure Resource group of which a given DFP instance is part. This name must be at least 1 character in length, and no more than 90.
    """
    ...