/etc/default/varnishlog is in varnish 3.0.2-1.
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 | # Configuration file for varnishlog
#
# Uncomment this to enable logging for varnish. Please make sure you have
# enough disk space for significant amounts of log data. To disable logging,
# set the variable to "0", "no", or leave it unset.
#
# Varnish log format, to be used by "varnishlog" or "varnishncsa"
# VARNISHLOG_ENABLED=1
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