pingHistoryResponse — Multiple manufacturers; see the original MIB MIB copies (LibreNMS/Observium Community), Edgecore MIB copies (Observium Community)
This variable represents the round trip time and is measured in milliseconds. The variable is the difference between received time and sent time for a ping probe. If the difference value is more than the time-out value or no response is received, then the variable will be 5000 milliseconds.