Man pages matching name pmeventflagsstr in section 3:

pmEventFlagsStr.3.en	debian 10 / libpcp3-dev
pmeventflagsstr.3.en	debian 10 / libpcp3-dev
pmEventFlagsStr.3.en	debian 11 / libpcp3-dev
pmEventFlagsStr.3.en	debian 12 / libpcp3-dev