Hi,
Are you talking about this Dashboard latency:

Or this latency dashboard page:

The API call you've mentioned gets stats on the latter, and these Latency, Jitter, Packet Loss and MOS values are there to support the SD-WAN performance based routing functionality and are only collected either if one end of the tunnel has dual uplinks, or you ask support to turn it on if you only have single uplinks.
---
COO
Highlight - Service Observability Platform
www.highlight.net