When you double-click the Meter processor function, the Meter dialog opens. This dialog consists of three different parts;
The Configuration tab, where you configure the processor
The Inspect tab where you can see details about the meter types and meters associated with the Meter processor along with their current values, see Inspect Meter Types and Meters
A preview section showing what the input and output data looks like.
In the Meter key field above the settings in the Configuration tab, an automatically created Meter key will be displayed. This key is unique for each Meter processor, and is one of the parameters used when creating meters using the APIs, see API Reference, and next to the field is a 
Copy button that you can use to copy the key when creating meters.
Note!
If you import a stream with a Meter processor which is a duplicate of an existing stream, a new Meter key willl be generated to ensure they are unique.
The Configuration tab contains the following settings:
Guiding Rules
The Meter Processor must have at least one guiding rule configured. You can add additional guiding rules by clicking the 
button at the bottom of the configuration screen. The maximum number of guiding rules is 10. Each guiding rule contains the following settings.
Setting | Description |
|---|---|
Guiding rule | |
Name | Enter an intuitive name for the guiding rule in this field. |
Condition setting | Select if you want to define customized conditions for the rule or not by selecting either No conditon or Custom condition. If you select No condition, nothing more is required, but if you select Custom condition, a new section called Condition n will appear that you can expand and enter any conditions you want to be met for the usage to be counted:  Each condition is configured with three settings:
For example: Field: location The name of the condition will now be converted to show your configuration which will make it easier to see the configured condition even after collapsing it. You can configure additional conditions by clicking on the |
Category to match | Select which category you want to count usage for in this drop-down. The Meter Processor is referring to categories instead of individual Meter Types which provides you with the possibility to add, remove, or update Meter Types whithout having to update the configuration of the Meter Processor. All existing categories configured in Meter Types will be displayed, see Creating Meter Types. |
Group by | |
Group by n | If you want to group the usage based on a specific field, for example region, click on the Group by n drop-down.  In this drop-down-list you can select the field(s) you want to group the usage by. You can either select an existing field or create a new field by entering a new field in the Add Field field and clicking on the + button. The maximum number of fields you can add for each Group by n section is 5. You can enter several Group by n sections by clicking on the Add group by button. The maximum number of Group by n sections is 5. |
Other operations | |
If you want to perform other operations, you can click on the Add operation button to display a section for defining operations that you want to be made:  | |
Operation | Select which type of operation you want to perform:
|
Field | Select the field you want to perform the Carry first or Carry last operation on. You can either select an existing field or create a new field by entering a new field in the Add Field field and clicking on the + button. |
Flush By
The Flush by setting determines when flush happens, that is when the aggregated output data records are sent to downstream systems. You have two options;
Period end - If you select this option, all meters will be flushed according to the Reset schedule defined for each meter type, see Creating Meter Types.
Stream execution - If you select this option, all meters will be flushed and reset at the end of stream execution, see Execution of Usage Metering Streams for further information about stream execution considerations.
Preview
Click on the 
to see a preview of the Input and Output data in the left part of the Meter dialog.
You can select to view the data in the following formats:
Input data: Table, tree
Output data: Table, tree, log