This read-only Counter64 is the current total number of send-direction packets lost for this VPath, i.e. packets that never arrived at the remote end. An admin monitors this cumulative loss figure as a direct quality-of-service indicator for outbound traffic across the overlay to a specific site. For example, a steadily climbing send-packets-lost count on the VPath to a remote warehouse would correlate with reports of degraded outbound video quality from that site.