Thanks Nikita for your response.
If VEEAM one checks for the average latency for last 15 mins, they why when the alarm is triggered the latency no. shown for the alarm is not the average latency no. but it is the latest latency spike seen in the vCenter performance graph for a vmdisk ?
Also, as per my understanding, VEEAM one polls data from vCenter server on realtime basis and vCenter real time performance charts are updated every 20 secs so does that mean that VEEAM one does the analytic and computes 15 min average latency and then shows the alert ?