Man pages matching name pmfreelabelsets in section 3:

pmFreeLabelSets.3.en	debian 10 / libpcp3-dev
pmfreelabelsets.3.en	debian 10 / libpcp3-dev
pmFreeLabelSets.3.en	debian 11 / libpcp3-dev
pmFreeLabelSets.3.en	debian 12 / libpcp3-dev