GENERATING AND STORING AGGREGATED METRICS FOR DIFFERENT AGGREGATION GRANULARITIES FOR DIFFERENT PERIODS OF TIME FOR MONITORING OF NETWORK ELEMENTS OF A SOFTWARE-DEFINED NETWORK

Some embodiments provide a novel method of presenting operational data from several network elements in a software-defined network (SDN). An operational data aggregator of the SDN receives a first request to view metric data for a first time period prior to a current time. The operational data aggregator presents the a first group of sets of aggregated metrics created for the first time period. The operational data aggregator also receives a second request to view metric data for a second time period prior to the current time. The operational data aggregator presents a second group of sets of aggregated metrics created for the second time period. The first group of sets of aggregated metrics has at least one aggregated metric set that is at a different aggregation granularity than all other sets of aggregated metrics in the second group of sets of aggregated metrics.