def METHOD_NAME(authorization_rule_name: Optional[str] = None,
                        namespace_name: Optional[str] = None,
                        resource_group_name: Optional[str] = None,
                        opts: Optional[pulumi.InvokeOptions] = None) -> AwaitableListNamespaceKeysResult:
    """
    Primary and secondary connection strings to the namespace.
    Azure REST API version: 2021-11-01.
    :param str authorization_rule_name: The authorization rule name.
    :param str namespace_name: The namespace name
    :param str resource_group_name: Name of the Resource group within the Azure subscription.
    """
    __args__ = dict()
    __args__['authorizationRuleName'] = authorization_rule_name
    __args__['namespaceName'] = namespace_name
    __args__['resourceGroupName'] = resource_group_name
    opts = pulumi.InvokeOptions.merge(_utilities.get_invoke_opts_defaults(), opts)
    __ret__ = pulumi.runtime.invoke('azure-native:relay:listNamespaceKeys', __args__, opts=opts, typ=ListNamespaceKeysResult).value
    return AwaitableListNamespaceKeysResult(
        key_name=pulumi.get(__ret__, 'key_name'),
        primary_connection_string=pulumi.get(__ret__, 'primary_connection_string'),
        primary_key=pulumi.get(__ret__, 'primary_key'),
        secondary_connection_string=pulumi.get(__ret__, 'secondary_connection_string'),
        secondary_key=pulumi.get(__ret__, 'secondary_key'))