RPM or Real-time performance monitoring

With the RPM tool, you configure and send probes to a specified target and monitor the analyzed results to determine packet loss, round-trip time, and jitter.

Real-time Performance Monitoring (RPM) Learning Byte

Tips and Tools for Assessing and Analyzing Network Efficiency

https://www.juniper.net/us/en/local/pdf/app-notes/3500145-en.pdf