> they have somewhat different views on the root cause? It sounds like an issue with naming the failure pattern rather than understanding it. The root cause wa

> they have somewhat different views on the root cause? It sounds like an issue with naming the failure pattern rather than understanding it. The root cause was equivalent to a memory leak in their custom auto scaling process; machine instances were not being freed (an “instance leak”). The fixed resource limit was self-induced by a hard-coded ratio between the number of proxy servers to web servers. Historically, the fixed ratio never reached a point where the “instance leak” caused failures but on one specific “Terrible, Horrible, No-Good, Very Bad Day” it failed badly.