Hokkaido-Sakhalin Cable System (HSCS): 0.02× baseline latency

What we measured

Path analysis

Traffic kept the same route. Latency rose without a visible path change, which points at congestion or a fault on the existing route rather than a reroute.

Cross-probe verdict. Only one probe saw it. We treat this as a probable false positive and label it as such.

Timeline

• 2026-04-30 20:30 UTC Alert 2026043004: warning — ratio 2.54x
• 2026-05-01 22:00 UTC Alert #102 resolved: RTT 1.48ms (baseline 88.18ms), 3 consecutive OK

Detection method

Latency is sampled continuously from our probe network. An alert opens when round-trip time to a monitored endpoint holds above its rolling baseline, and closes automatically once it returns. Full method is described on the methodology page.

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