A severity of a particular type is trigged whenever the returned value from the check is higher than the configured threshold, the baseline.
The notification threshold / baseline can be defined in several ways.
| Setting | Description |
|---|---|
| Method | Constant / Average / Median / Deviation |
| Percentage | Percentage threshold based on the calculated value. |
| Deviation | Number of standard deviations |
| Period | Time period for historical results to include in the calculation. |
| Offset | Constant to add to the calculated value. |
Static calculations uses a constant threshold value.
Dynamic methods calculate the threshold value on the fly, based on a combination of the type (percentage or deviation), the method (average, median, deviation), the period (time frame for historical data to use), and offset which is added to the calculated value.
| Method | Calculation | Type | Example |
|---|---|---|---|
| Constant | A fixed value. | Static | 25 |
| Average | Average. | Dynamic | 120% of the average returned value for the last 2 hours + offset 50. |
| Median | Median. | Dynamic | 120% of the median value for the last 2 hours + offset 50. |
| Deviation | Standard deviation. | Dynamic | 2 standard deviations + average value for the last 2 hours + offset 50. |