This file is indexed.

/etc/logrotate.d/dpkg is in dpkg 1.19.0.5ubuntu2.

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

The actual contents of the file can be viewed below.

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/var/log/dpkg.log {
	monthly
	rotate 12
	compress
	delaycompress
	missingok
	notifempty
	create 644 root root
}