This file is indexed.

/etc/cloud/cloud.cfg.d/README is in cloud-init 18.2-14-g6d48d265-0ubuntu1.

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

The actual contents of the file can be viewed below.

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# All files in this directory will be read by cloud-init
# They are read in lexical order.  Later files overwrite values in
# earlier files.