Alert Expressions

Alert Expressions

Alert expressions provide a way to modify widget graphical properties such as color, fill, and visibility based on series values and statistics.

Example:

Change bar color to RED if the threshold is exceeded.
If the threshold is within the normal range, but was violated at least once during the last hour, change the bar color to YELLOW .
Otherwise, apply GREEN as the color.

[widget]
  type = bar
  color = yellowgreen
 
  alert-expression = max('1 hour') > 75 ? ((value > 75) ? 2 : 1) : false
  alert-style = (alert == 2) ? 'fill: red; stroke: red' : 'fill: yellow; stroke: yellow'
 
  [column]
    [series]
      entity = nurswgvml007  
  [column]
    [series]
      entity = nurswgvml006
  [column]
    [series]
      entity = nurswgvml010

Chartlab Example