bbeaudreault opened a new pull request, #5067:
URL: https://github.com/apache/hbase/pull/5067

   - Adds `countofBlockBytesScanned` to ScanMetrics, and incorporates that into 
TestScannerBlockSizeLimits assertions.
   - Renames server side RpcCall's counter from `responseBlockBytes` to 
`blockBytesScanned`. This seems more straightforward in the context of a 
request.
   - Adds histograms for each of get, scan, increment, append, checkAndMutate, 
as well as an overall `blockBytesScannedCount` to Regionserver and 
TableLatencies metrics
   
   This is mostly boilerplate. Since blockBytesScanned increments globally for 
a request, we have to treat it similarly to time when calling the various 
per-request update methods -- subtract `after - before` for multi's to get the 
per-action value.


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