Work toward fixing ONOS-1138: Batching topo event may cause event loss
Added another metric to the onos-app-metrics-topology application to collect and display the number and rate of the Reasons for the Topology Events. Example: onos> topology-events-metrics ... Topology Graph Event Timestamp (ms from epoch)=1426699861509 Topology Graph Events count=6 rate(events/sec) mean=0.002315 m1=0.000000 m5=0.000004 m15=0.000378 Topology Graph Reasons Event Timestamp (ms from epoch)=1426699861509 Topology Graph Reasons Events count=9 rate(events/sec) mean=0.003472 m1=0.000000 m5=0.000005 m15=0.000567 The corresponding object names in the JSON output are: topologyGraphReasonsEventRate topologyGraphReasonsEventTimestamp Change-Id: Ib1aeb83c38b3b72d0ae8a4f49bc1e14badc0199d
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