This file is indexed.

/etc/apt/apt.conf.d/01autoremove-gce is in gce-compute-image-packages 20180129+dfsg1-0ubuntu3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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APT
{
  NeverAutoRemove
  {
    "gce-compute-image-packages.*";
    "google-compute-engine.*";
    "python-google-compute-engine.*";
    "python3-google-compute-engine.*";
  };
};