Man pages matching name pmiaddmetric in section 3:

pmiAddMetric.3.en	debian 10 / libpcp3-dev
pmiaddmetric.3.en	debian 10 / libpcp3-dev
pmiAddMetric.3.en	debian 11 / libpcp3-dev
pmiAddMetric.3.en	debian 12 / libpcp3-dev