The average round trip time of all the packets that have been sent in this sequence.The value returned to a GET request is meaningless if no ping response in a sequence has been received yet.
Sources for this description
Multiple manufacturers; see the original MIB MIB copies (LibreNMS/Observium Community)Dell MIB copies (LibreNMS/Observium Community)D-Link official switch MIBsNetdisco MIB archive copiesNETGEAR official product and EOL MIB downloads