Configuring ratio alerts

Note: When creating ratio alerts, timestamps for events are assigned in real time, while session-end events for alerts receive a timestamp when the session closes, which may be in a different alert time period window. Unexpected ratio counts may be generated if these two types of events are mixed in ratio alerts. Whenever possible, compare events with the same execution timeframe.

The following properties apply when the alert type is set to Ratio.

  • In the generated alert, drill-down is disabled for ratio alerts.
Property
Description
Alert Type
Type of alert is set to Ratio. See Alert types.
Numerator
Click the <Select Event> link to select the event that is the numerator for the ratio. The Event Selector is displayed. Click the event. The event name is inserted into the Configuration tab.
  • To remove the selected event, click the X icon next to the event name.
Denominator
Select the type of denominator for the event:
  • Event List - List of values that are specified in the whitelist for a selected event. When this option is selected, click <Select Event> link to open the Event Selector.
  • Page Count - A count of pages in a 1 minute interval
  • Session Count - A count of sessions in a 1 minute interval
Min. Value
This setting determines when a ratio event has enough samples to be meaningful (for example, the denominator must be at least the number in this field before the threshold is evaluated).
Alert Threshold
The value at which an alert message is created.
  • Threshold values must be greater than zero. For ratio alerts, you may enter decimal values.
Direction
The available options are Positive (default) and Negative.
  • A negative alert results in alerting when a value less than the Alert Threshold was recorded.
Alert Interval
Time in minutes to accumulate the event values for alerting. The interval is a rolling window of time.
  • Values range from 1 minute to a maximum value of 1440 minutes (24 hours).
    Note: Since the alert service operates on time-based intervals, you cannot configure alerts to fire on each page or for each occurrence of the underlying event.
Alert Reset
The time interval in minutes after an alert of this type was created and no other alerts of this type can be created. After the reset period expired, the alert counter is reset back to zero.
Enable Warnings
When selected, warning alerts are generated when the specified warning thresholds were reached.
Warning Threshold
The value at which a warning message is created. For Mean alerts, this field accepts values as integer percentages, representing percentage deviations of a sample value from an AlertService calculated mean value.
  • Threshold values must be greater than zero. For Anomaly Detection, Anomaly Detection report, and event ratio alerts, you may enter decimal values. For other alert types, entered values must be integers.
Warning Reset
The time interval in minutes after a warning was created and no other warnings can be created. An alert can be created during this interval.