Man pages matching name google::protocolbuffers in section 3pm:

Google::ProtocolBuffers.3pm.en	debian 10 / libgoogle-protocolbuffers-perl
Google::ProtocolBuffers.3pm.en	debian 11 / libgoogle-protocolbuffers-perl
Google::ProtocolBuffers.3pm.en	debian 12 / libgoogle-protocolbuffers-perl