Man pages matching name smokeping_probes_echopingdns in section 3:

Smokeping_probes_EchoPingDNS.3.en	debian 10 / smokeping
Smokeping_probes_EchoPingDNS.3.en	debian 11 / smokeping
Smokeping_probes_EchoPingDNS.3.en	debian 12 / smokeping