Man pages matching name pmgetarchivelabel in section 3:

pmGetArchiveLabel.3.en	debian 10 / libpcp3-dev
pmgetarchivelabel.3.en	debian 10 / libpcp3-dev
pmGetArchiveLabel.3.en	debian 11 / libpcp3-dev
pmGetArchiveLabel.3.en	debian 12 / libpcp3-dev