/var/lib/pcp/config/pmchart/Sockets 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.
1 2 3 4 5 6 7 | #kmchart
version 1
chart title "Sockets in Use [%h]" style plot
optional-plot legend "TCP" metric network.sockstat.tcp.inuse
optional-plot legend "UDP" metric network.sockstat.udp.inuse
optional-plot legend "Raw" metric network.sockstat.raw.inuse
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