Counter / Final value
With final value measurement, tally up all billable events over a set time period. This approach is suitable for measuring cumulative usage, such as the total number of API calls in a month.Example

sum(billable events) * unit price = total
.
In the illustrated graph,
Use cases
API Usage
API Usage
Number of API calls used in a month.
Exported Documents
Exported Documents
Count of document exports by a customer.
Service Requests
Service Requests
Total service requests made by a client.
Gauges / Prorated
With prorated measurement, tally up billable events per time unit over a set period. This method is ideal for tracking usage over time, such as virtual machine hours used in a month.Example

((billable events * time unit (days), ...) * unit price = total
.
In the illustrated graph,
Use cases
Virtual Machine Usage
Virtual Machine Usage
Number of virtual machine hours used in a month.
Subscription Tier Utilization
Subscription Tier Utilization
Hours spent in different subscription tiers.
Feature Utilization
Feature Utilization
Time spent using specific features within a service.