Man pages matching name pmmergelabels in section 3:

pmMergeLabels.3.en	debian 10 / libpcp3-dev
pmmergelabels.3.en	debian 10 / libpcp3-dev
pmMergeLabels.3.en	debian 11 / libpcp3-dev
pmMergeLabels.3.en	debian 12 / libpcp3-dev