/var/lib/pcp/config/pmsnap/crontab is in pcp-gui 4.0.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Standard Performance Co-Pilot pmsnap crontab entry for a PCP site
# with one or more pmlogger instances running
#
# every 30 minutes, generate snapshot images
30,0 * * * * PCP_BIN_DIR/pmsnap # -d DISPLAY
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