Minor Description
TabletServerMetricsUtil getIngest should return ingest rate not entries in memory.
Currently, the utility TabletServerMetricsUtil that exposes ingest rate is calculating the rate as entries in memory for each node. This should be changed to something more akin to: https://github.com/apache/accumulo/blob/master/server/tserver/src/main/java/org/apache/accumulo/tserver/TabletServer.java#L1410. Which will calculate the ingest rate per tablet.
