/usr/share/doc/cloud-init/examples/cloud-config-vendor-data.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 15 16 | #cloud-config
#
# This explains how to control vendordata via a cloud-config
#
# On select Datasources, vendors have a channel for the consumptions
# of all support user-data types via a special channel called
# vendordata. Users of the end system are given ultimate control.
#
vendor_data:
enabled: True
prefix: /usr/bin/ltrace
# enabled: whether it is enabled or not
# prefix: the command to run before any vendor scripts.
# Note: this is a fairly weak method of containment. It should
# be used to profile a script, not to prevent its run
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