Delta

Description

 Transforms each sample in the time series to the difference between the sample and the previous one.

Input

 Time Series – multiple (Single or multiple time series.)

Parameters

 Keep Last Value Limit

Optional, numeric, default=null (Limit of null values to skip.)

Output

 Transformed Time Series - multiple

Available in

Alerts + Composite + Dashboards

The Delta function is useful when you have a metric whose value increases monotonically. By applying this function, you can monitor the difference between two successive samples in the metric, and catch anomalous changes in the increase rate.

For example, server uptime is usually measured using a counter metric. Here is how the raw data looks before applying the function: 

Delta0.png

Upon applying the Delta function, we can easily monitor even minor anomalies in the change rate of the server uptime: 

Delta1.png


Note: In case the metric value increases monotonically and occasionally resets to zero (e.g., on restart), use the NonNegativeDelta function instead.

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