Required. Resource name of the parent containing the listed services, either a `project
A filter specifying what ``Service``\ s to return. The filter currently supports the following fields: :: - `identifier_case` - `app_engine.module_id` - `cloud_endpoints.service` (reserved for future use) - `mesh_istio.mesh_uid` - `mesh_istio.service_namespace` - `mesh_istio.service_name` - `cluster_istio.location` (deprecated) - `cluster_istio.cluster_name` (deprecated) - `cluster_istio.service_namespace` (deprecated) - `cluster_istio.service_name` (deprecated) ``identifier_case`` refers to which option in the identifier oneof is populated. For example, the filter ``identifier_case = "CUSTOM"`` would match all services with a value for the ``custom`` field. Valid options are "CUSTOM", "APP_ENGINE", "MESH_ISTIO", plus "CLUSTER_ISTIO" (deprecated) and "CLOUD_ENDPOINTS" (reserved for future use).
A non-negative number that is the maximum number of results to return. When 0, use default page size.
If this field is not empty then it must contain the ``nextPageToken`` value returned by a previous call to this method. Using this field causes the method to return additional results from the previous method call.