Yeah that's a total bug.

The outlier multiplier & constant:
Norbert has a facility to exponential backoff from a node. It will calculate cluster median latency & node median latency. It will backoff if node_latency > outlier_multiplier * cluster_latency + outlier_constant

This helps a lot of a node starts GCing, but can hurt if your node is serving a cache file since it will drop hit rates.