/var/lib/pcp/config/pmchart/Swap is in pcp-gui 3.10.8build1.
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 | #kmchart
version 1
chart title "Logical Swap Allocation [%h]" style stacking
optional-plot legend "Free" color #16e116 metric swap.free
optional-plot legend "Used" color #e71717 metric swap.used
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