You can select the data interval when the multiple data intervals are collected for a time-series attribute. In this scenario the alert evaluation is performed only on one qualified interval that is received first in a day. The interval is considered as qualified if it meets the m/n criteria. The data importer picks the different qualified interval on the next day or when the day is changed.
For example: Alert definition criteria = 1/5 (1 violation in 5 minutes)
If the data is received in the following intervals: 600-second, 300-second, and 60-second, the following three scenarios are possible:
- Case 1: If the importer first receives the data interval of 600-second:
- m = 1
- n = 5
- Number of samples in n minutes = (n/data interval in minutes) = (5/10) = 0
Therefore, zero data samples occur in n minutes (5 minutes).
In this scenario, the 600-second interval does not qualify for alert evaluation.
Note: In this scenario, the qualified interval for a violation computation is either 300-second or 60-second, whichever is received first after 600-second. This qualified interval for alert violation computation is only for current day data. It changes after the data is received the next day. On the next day, the system performs the same calculation to determine the qualified interval. - Case 2: If the importer first receives the data interval of 300-second:
- m = 1
- n = 5
- Number of samples in n minutes = (n/data interval in minutes) = (5/5) = 1
Therefore, one data sample occurs in n minutes (5 minutes).
In this scenario, the 300-second interval qualifies for alert evaluation.
Once the importer determines the qualified data interval, it skips all other incoming intervals for that day irrespective of whether they qualify or not. Here, since the 300-second interval is qualified first, a 60-second interval is ignored even if it qualifies.
- Case 3: If the importer first receives the data interval of 60-second:
- m = 1
- n = 5
- Number of samples in n minutes = (n/data interval in minutes) = (5/1) = 5
Therefore, 5 data samples occurs in n minutes (5 minutes).
In this scenario, the 60-second interval qualifies for alert evaluation.