Github user sjcorbett commented on the pull request: https://github.com/apache/brooklyn-server/pull/112#issuecomment-208845961 Thinking about this a bit more closely, you've deprecated a `ConfigKey<Function<Collection<Entity>, Entity>>` in favour of a `ConfigKey<RemovalStrategy>`, but the `RemovalStrategy` class implements `Function<Collection<Entity>, Optional<Entity>`. You could avoid all of the deprecation hassle by leaving the config key the same and altering `RemovalStrategy` to implement `Function<Collection<Entity>, Entity>`. The result is identical, no?
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