Functions use case catalogue

Arithmetic operations

• Scale -
  Multiplies each data point by the provided scale factor
• Offset -
  Add a fixed value to all data points
• SumSeries -
  Sum a group of metrics

Data validation

• CountSeries -
  Returns the number of metrics reported in each time point
• PercentMissingValues -
  Returns % missing values for each metric in the selected time range

Data interpretation

• Delta -
  Useful when you need to monitor the difference between two successive samples in a counter metric (whose values increases monotonically)
• NonNegativeDelta -
  Similar to the Delta function above, this one is useful when you have a metric whose value increases monotonically, and occasionally resets to zero (e.g., on restart)
• AsPercent -
  Applying the  function on a group of metrics will return the contribution of each metric data point to the total sum as a percentage.

Help fit better baselines

• expMovingAverage -
  Useful for smoothing noisy metrics, which helps fit a better baseline (= better detection).

Perform operations between matched metric pairs

• ratioPairs -
  Divide one group of metrics by another to monitor the ratio between matched samples.

Compare metric patterns across time

• TimeShift + Alias
  Useful for inspecting whether cyclic / seasonal patterns are seen consistently across a selected time range.