Man pages matching name cpg_zcb_mcast_joined in section 3:

cpg_zcb_mcast_joined.3.en	debian 10 / libcpg-dev
cpg_zcb_mcast_joined.3.en	debian 11 / libcpg-dev
cpg_zcb_mcast_joined.3.en	debian 12 / libcpg-dev