[8.15](backport #41356) Restore memory queue's internal event cleanup after a batch is vended #41362
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…#41356) Fix #41355, where event data in the memory queue was not being freed when event batches were acknowledged, but only gradually as the queue buffer was overwritten by later events. This gave the same effect as if all beat instances, even low-volume ones, were running with a full / saturated event queue. The root cause, found by @swiatekm, is [this PR](#39584), an unrelated cleanup of old code that accidentally included one live call along with the deprecated ones. (There was an old `FreeEntries` hook in pipeline batches that was only used for deprecated shipper configs, but the cleanup also removed the `FreeEntries` call _inside_ the queue which was essential for releasing event memory.) (cherry picked from commit fdb912a)
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Fix #41355, where event data in the memory queue was not being freed when event batches were acknowledged, but only gradually as the queue buffer was overwritten by later events. This gave the same effect as if all beat instances, even low-volume ones, were running with a full / saturated event queue.
The root cause, found by @swiatekm, is this PR, an unrelated cleanup of old code that accidentally included one live call along with the deprecated ones. (There was an old
FreeEntrieshook in pipeline batches that was only used for deprecated shipper configs, but the cleanup also removed theFreeEntriescall inside the queue which was essential for releasing event memory.)Checklist
I have made corresponding changes to the documentationI have made corresponding change to the default configuration filesCHANGELOG.next.asciidocorCHANGELOG-developer.next.asciidoc.Related issues
This is an automatic backport of pull request #41356 done by [Mergify](https://mergify.com).