def METHOD_NAME(self):
    """Return all the Roles under the Identity namespace.
    Returns:
        (list): A list containing all the Roles under the Identity
            namespace.
    """
    prefix = _IDENTITY_NS + _ROLE_NS
    rolelist_list = [
        _create_from_bytes(d, identity_pb2.RoleList)
        for _, d in self._state_view.leaves(prefix=prefix)
    ]
    roles = []
    for role_list in rolelist_list:
        for role in role_list.roles:
            roles.append(role)
    return sorted(roles, key=lambda r: r.name)