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* Add tier based usage metrics for historical nodes to help with druid historical autoscaling Add tier based usage metrics for historical nodes to help druid cluster orchestration systems understand the historical node usage and requirements. Following metrics would be helpful - tier/required/capacity- total capacity in bytes required in each tier. Dimensions - tier tier/total/capacity - total capacity in bytes available in a given tier. Dimension - tier tier/historical/count - no. of historical nodes available in each tier. Dimension - tier tier/replication/factor - configured maximum replication factor in given tier. Dimension - tier * fix unit test failures