Quota counters represent the current status of quotas for all clients subject to quota rules.
Single client may have multiple quota counters, one for each applied quota rule. You can see here client and quota rule for which quota counter was created, the remaining traffic (in megabytes) and the quota reset period (if any). Administrator can manually change the value of remaining traffic amount in the properties of a quota counter.
|Quota Counters (click to enlarge figure)|
Quota counters are stored to the database periodically, approximately every 15 minutes, but you can always see the actual counter values in the console.