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glossary:t:threshold [2018/06/11 18:54] (current)
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 +# Threshold
 +
 +A [severity](/​glossary/​s/​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.
 +
 +## Settings
 +
 +^ 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. |
 +
 +
 +## Calculations
 +
 +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](/​glossary/​a/​average). | Dynamic | `120%` of the `average` returned value for the last 2 hours + offset `50`. |
 +| Median | [Median](/​glossary/​m/​median). | Dynamic | `120%` of the `median` value for the last 2 hours + offset `50`. |
 +| Deviation | [Standard deviation](/​glossary/​s/​standard_deviation). | Dynamic | `2 standard deviations` + `average` value for the last `2` hours + offset `50`. |