Our new check PerfAggregate measures various performance counters per aggregate. Currently, the following counters can be monitored: aggr_throughput (B/s) latency (µs) read_data (B/s) total_transfers (/s) total_transfers_hdd (/s) total_transfers_ssd (/s) transmit_failure (-) user_read_blocks (/s) user_read_latency …