The /etc/cloud/cloud.cfg will be also be filtered, expected content is not collected.

[xiangce]

When specifying the filters of the cloud_cfg spec as

add_filter(Specs.cloud_cfg, ['network', 'ssh_deletekeys', 'debug'])

The collected file will look like:

{"debug": {"output": "/var/log/cloud-init-debug.log"}, "network": null, "ssh_deletekeys": 1}

But in fact, the original content is:

users:
  - name: demo
    ssh-authorized-keys:
      - key_one
      - key_two
    passwd: $6$j212wezy$7H/1LT4f9/N3wpgNunhsIqtMj62OKiS3nyNwuizouQc3u7MbYCarYeAHWYPYb2FT.lbioDm2RrkJPb9BZMN1O/

ssh_deletekeys: 1

network:
    version: 1
    config:
    - type: physical
        name: eth0
        subnets:
          - type: dhcp
          - type: dhcp6

system_info:
    default_user:
    name: user2
    plain_text_passwd: 'someP@assword'
    home: /home/user2

debug:
    output: /var/log/cloud-init-debug.log
    verbose: true

The expected network should not be null