What is a threshold?

A thresholds marks the performance boundaries for a producer. When a producer goes beyond (above or below) these boundaries, threshold changes status, thus letting you know this producer needs attention.

Threshold Concepts to Remember

• There are not build-in thresholds.
  It is you who create them, every time
  
  
• Thresholds are not created automatically. 
  You choose a producer and then add a threshold to it.
  
  
• A threshold monitors one parameter.
  Only one, not several. 
  
  

• There are no default boundary values for new thresholds.
  It's you who defines the values, thus telling a threshold when to change color. 

Adding Thresholds

Via WebUI

To add a threshold via WebUI:

First, you'll have to know what parameter are you going to monitor. Let's continue with an example above and say we would like to know the SessionCount (the number of sessions) on our website.

1. Go to Producers tab.
2. Find and click the needed producer (SessionCount in our case)
   
   
   
3. On the appearing producer page, click the Add Threshold button (upper-right corner).
   
4. In the appearing New Threshold box:
   
   
   1. 1. name the new threshold (Name box),
      2. select the monitoring interval (Interval menu),
      3. choose the measurement units (Unit menu),
      4. specify boundary values for threshold statuses:
         1. choose if the value should be above/below your entry (above/below menus),
         2. fill in the values.

   

5. Go to Stats ans StatValues Table below the New Threshold box, choose the value to monitor and click the corresponding ADD link.

Congratulations, a new threshold has been added!

Now you can see it among the others on the Thresholds tab.

Programmatically

This section shall be added soon.

For now, please kindly add thresholds via WebUI.

Thresholds Tab

To see all active thresholds: click the Thresholds tab.

The Thresholds tab has 2 display sections:

1. System state,
2. History. 

This section shows all thresholds that you've created and have not deleted yet.

The section has 6 columns:

The section also has 2 control elements: Edit and Delete icons.

To edit a threshold:

1. Click the corresponding Edit icon () on the same line with the needed threshold.
2. On the appearing page, specify the new name or the boundary value.
3. Click the Update button.

To delete a threshold: click the corresponding Delete icon () on the same line with the needed threshold.

Threshold screen

The threshold screen is a private threshold's space that contains all the essential threshold info (including settings for boundary values).

To see the threshold screen: select a threshold and click its name link (in the Name column of System State ).

History Display Section

This section lists all threshold status changes (including deleted thresholds).

As soon as you create a new threshold and it passes its first monitoring interval, a new status change line appears in History display. Also, any status change with existing thresholds is also being reflected here.

 The Section has 4 columns:

Inactive Thresholds

Some of the thresholds might be inactive, you will know them by grey status color.

Why do they appear and what to do with them? See the Table below.