Hello, 

I'm trying to monitor cluster-sharding. In particular, I'd like to detect 
rebalance operations when they happen. Using a.c.s.DDataShardCoordinator. 

The cluster-events subscription model perhaps has a sharding counterpart? 
See
https://doc.akka.io/docs/akka/2.5/cluster-usage.html#subscribe-to-cluster-events

DDataShardCoordinator puts out some logs which are useful, but perhaps 
there are some events I could just listen to? See below for some log output.

16:05:13.965 DEBUG  a.c.s.DDataShardCoordinator Shard [16] allocated at 
[Actor[akka.tcp://MuhServer@muh-host-3:2551/system/sharding/gremlins#106334292]]
16:05:13.972 DEBUG  a.c.s.DDataShardCoordinator The coordinator state was 
successfully updated with 
ShardHomeAllocated(4,Actor[akka.tcp://MuhServer@muh-host-2:2551/system/sharding/gremlins#340317110])
16:05:13.972 DEBUG  a.c.s.DDataShardCoordinator Shard [4] allocated at 
[Actor[akka.tcp://MuhServer@muh-host-2:2551/system/sharding/gremlins#340317110]]
16:05:23.232 DEBUG  a.c.s.DDataShardCoordinator Rebalance shard [2] from 
[Actor[akka://MuhServer/system/sharding/gremlins#1737908169]]
16:05:23.233 DEBUG  a.c.s.DDataShardCoordinator Rebalance shard [13] from 
[Actor[akka://MuhServer/system/sharding/gremlins#1737908169]]
16:05:23.233 DEBUG  a.c.s.DDataShardCoordinator Rebalance shard [14] from 
[Actor[akka://MuhServer/system/sharding/gremlins#1737908169]]
16:05:23.239 DEBUG  a.c.s.DDataShardCoordinator GetShardHome [13] request 
ignored, because rebalance is in progress for this shard.
16:05:23.240 DEBUG  a.c.s.DDataShardCoordinator GetShardHome [14] request 
ignored, because rebalance is in progress for this shard.
16:05:23.240 DEBUG  a.c.s.DDataShardCoordinator Rebalance shard [2] done 
[true]
16:05:23.245 DEBUG  a.c.s.DDataShardCoordinator The coordinator state was 
successfully updated with ShardHomeDeallocated(2)
16:05:23.245 DEBUG  a.c.s.DDataShardCoordinator Shard [2] deallocated
16:05:23.245 DEBUG  a.c.s.DDataShardCoordinator Rebalance shard [14] done 
[true]

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