/etc/cfengine/debian-edu/cf.sysstat is in debian-edu-config 1.702.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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  debian.server::
	# The contents of the file /etc/default/sysstat controls whether
	# sar runs or not.
	# Need to make sure that the line saying
	# ENABLED="false" (the default on install)
	# is changed to
	# ENABLED="true"
	# Probably only worthwhile to do this on servers:q
	{ /etc/default/sysstat 
	      LocateLineMatching 'ENABLED="false"'
	      ReplaceLineWith 'ENABLED="true"'
	}
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