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If the informers handlers are slow processing the objects, the deltaFIFO blocks the queue and the streamWatchers can not add new elements to the queue, creating contention and causing different problems, like high memory usage. The problem is not easy to identify from a user perspective, typically you can use pprof to identify a high memory usage on the StreamWatchers or some handler consuming most of the cpu time, but users should not have to profile the golang binary in order to know that. Metrics were disabled on the reflector because of memory leaks, also monitoring the queue depth can't give a good signal, since it never goes high However, we can trace slow handlers and inform users about the problem. Kubernetes-commit: d38c2df2c4b945bcf1f81714fc6bfd01bbd0f538