This file is indexed.

/var/lib/pcp/config/pmchart/Diskbytes is in pcp-gui 1.5.11.

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

The actual contents of the file can be viewed below.

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#kmchart
version 1

chart title "Disk Throughput [%h]" style stacking
	plot legend "Read rate" color yellow metric disk.all.read_bytes
	plot legend "Write rate" color violet metric disk.all.write_bytes