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I propose to add three gauge: DeadFetcherThreadCount for the fetcher threads, dead- log-cleaner-dead-thread-count for the log cleaner. All of these are broker level metrics.

DeadFetcherThreadCount: this basically exposes the count of non-alive threads in the internal thread map in AbstractFetcherManager.
dead-log-cleaner-dead-thread-count: this would expose the difference between the number of configured threads and size of the ArrayBuffer that maintains the CleanerThread instances in LogCleaner. 

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