I noticed that the base docker image does not appear in the autoscaler task' configuration_object
which is:
[{"resource_name": "cpu_default", "machine_type": "n1-standard-1", "cpu_only": true, "gpu_type": "", "gpu_count": 1, "preemptible": false, "num_instances": 5, "queue_name": "default", "source_image": "projects/ubuntu-os-cloud/global/images/ubuntu-1804-bionic-v20220131", "disk_size_gb": 100}, {"resource_name": "cpu_services", "machine_type": "n1-standard-1", "cpu_only": true, "gpu_type": "", "gpu_count": 1, "preemptible": false, "num_instances": 1, "queue_name": "services", "source_image": "projects/ubuntu-os-cloud/global/images/ubuntu-1804-bionic-v20220131", "disk_size_gb": 100}]