/usr/share/man/man3/pmdamain.3.gz is in libpcp-pmda3-dev 3.9.10.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man3/pmdaGetContext.3.gz
/usr/share/man/man3/pmdaGetContext.3.gz