Man pages matching name pmda in section 3:

PMDA.3.en	debian 10 / libpcp-pmda3-dev
pmda.3.en	debian 10 / libpcp-pmda3-dev
PMDA.3.en	debian 11 / libpcp-pmda3-dev
PMDA.3.en	debian 12 / libpcp-pmda3-dev