Man pages matching name pmisethostname in section 3:

pmiSetHostname.3.en	debian 10 / libpcp3-dev
pmisethostname.3.en	debian 10 / libpcp3-dev
pmiSetHostname.3.en	debian 11 / libpcp3-dev
pmiSetHostname.3.en	debian 12 / libpcp3-dev