/var/lib/pcp/config/derived/proc.conf is in pcp-conf 4.0.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | # derived metrics for processes
proc.psinfo.age = kernel.all.uptime - proc.psinfo.start_time
proc.io.total_bytes = instant(proc.io.read_bytes) + instant(proc.io.write_bytes) - instant(proc.io.cancelled_write_bytes)
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