I should blog about it but it's essentially two things
1) "A lot" of nodes, (1 42U rack is one cluster, with battery backup and redundant switching)
2) Hybrid cloud, a few nodes of this particular cluster run in GCP (kind of cheating :P)
Okay, well you’ve still not highlighted was is the preferred method here, since even with a 42u rack and a cluster in GCP, you still wouldn’t run kubernetes