Man pages matching name pmdastore in section 3:

pmdaStore.3.en	debian 10 / libpcp-pmda3-dev
pmdastore.3.en	debian 10 / libpcp-pmda3-dev
pmdaStore.3.en	debian 11 / libpcp-pmda3-dev
pmdaStore.3.en	debian 12 / libpcp-pmda3-dev