Improve usage report with batch_num and max_ttl

[hengfeiyang]

Which OpenObserve functionalities are relevant/related to the feature request?

No response

Description

we do batch commit for usage report. but if we can't reach the limit it never report data, we some also add a time limit, even it didn't reach the batch_num, it already past x seconds, it also should be commit.

Proposed solution

Alternatives considered