Select two metrics a cloud Edge router should use to choose the optimal path to a SaaS application reachable via a gateway site.

A cloud Edge router needs to determine the best path for SaaS traffic. HTTP loss and latency metrics directly to the SaaS application are crucial because they measure the actual user experience and application performance, which is the ultimate goal. BFD (Bidirectional Forwarding Detection) loss and latency metrics to the gateway site are also vital. The gateway site is the exit point from the SD-WAN fabric towards the internet or SaaS provider. BFD provides fast detection of path failures and performance degradation between the Edge router and this critical next hop, ensuring the SD-WAN fabric itself is healthy up to the gateway. ICMP metrics to the SaaS application are less reliable than HTTP because ICMP might be rate-limited or blocked by firewalls, not reflecting actual application performance. HTTP metrics to the gateway site are less relevant than to the SaaS application itself, as the gateway is just an intermediary. BFD metrics to the SaaS application are not feasible; BFD is typically used between network devices within the SD-WAN fabric or to directly connected peers, not end-user applications over the internet.