Man pages matching name pmhttpnewclient in section 3:

pmhttpNewClient.3.en	debian 10 / libpcp-web1-dev
pmhttpnewclient.3.en	debian 10 / libpcp-web1-dev
pmhttpNewClient.3.en	debian 11 / libpcp-web1-dev
pmhttpNewClient.3.en	debian 12 / libpcp-web1-dev