Currently Weighted sum aggregation doesn't support sending absolute values. For example, if we are measuring storage like S3, and at any instance user uploads 5 GB of data, we send unit property as 5, now when user deletes some data(say 1 GB) we need to send -1(relative to previously sent reading) instead of 4.

Generally in large systems not every byte of upload and delete is measured, rather total storage at the end of the day is measured. So what happens is we need to store what reading we submitted in last event. So when we get a current storage size of user, we need to calculate the difference from previous reading and then send that difference in the event which can lead to inconsistencies and involves storing previous readings for all customers. Hence it will be very helpful if we can send usage meter property in absolute value.

Basically I am requesting recurring time weighted LATEST aggregate!