/var/lib/pcp/testsuite/864.out is in pcp-testsuite 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 | QA output created by 864
#<--------CPU--------><----------Disks-----------><----------Network---------->
#cpu sys inter ctxsw KBRead Reads KBWrit Writes KBIn PktIn KBOut PktOut
NN NN NN NN NN NN NN NN NN NN NN NN
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