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fca7a19713
Today the `DiskThresholdMonitor` limits the frequency with which it submits reroute tasks, but it might still submit these tasks faster than the master can process them if, for instance, each reroute takes over 60 seconds. This causes a problem since the reroute task runs with priority `IMMEDIATE` and is always scheduled when there is a node over the high watermark, so this can starve any other pending tasks on the master. This change avoids further updates from the monitor while its last task(s) are still in progress, and it measures the time of each update from the completion time of the reroute task rather than its start time, to allow a larger window for other tasks to run. It also now makes use of the `RoutingService` to submit the reroute task, in order to batch this task with any other pending reroutes. It enhances the `RoutingService` to notify its listeners on completion. Fixes #40174 Relates #42559