/usr/share/doc/cloud-init/examples/cloud-config-phone-home.txt is in cloud-init 0.7.6~bzr976-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | #cloud-config
# phone_home: if this dictionary is present, then the phone_home
# cloud-config module will post specified data back to the given
# url
# default: none
# phone_home:
# url: http://my.foo.bar/$INSTANCE/
# post: all
# tries: 10
#
phone_home:
url: http://my.example.com/$INSTANCE_ID/
post: [ pub_key_dsa, pub_key_rsa, pub_key_ecdsa, instance_id ]
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