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aec44fecbc
Today the `ClusterInfoService` requires the `DiskThresholdMonitor` at construction time so that it can notify it when nodes report changes in their disk usage, but this is awkward to construct: the `DiskThresholdMonitor` requires a `RerouteService` which requires an `AllocationService` which comees from the `ClusterModule` which requires the `ClusterInfoService`. Today we break the cycle with a `LazilyInitializedRerouteService` which is itself a little ugly. This commit replaces this with a more traditional subject/observer relationship between the `ClusterInfoService` and the `DiskThresholdMonitor`.