nodece opened a new pull request, #26171:
URL: https://github.com/apache/pulsar/pull/26171
### Motivation
`BucketDelayedMessageIndexStats` used `LongAdder.sumThenReset()` for
operation
counts and `StatsBuckets.refresh()` for latency buckets. Since both reset
their
internal counters after reading, every stats collection cleared the
accumulated
metrics. As a result, both topic stats and exported metrics only reported
values
from the first read after new operations, while subsequent reads returned
zero
until more operations occurred.
### Modifications
* Add `StatsBuckets.snapshot()` to read cumulative values without resetting
internal counters.
* Switch `BucketDelayedMessageIndexStats` to use cumulative reads for
operation
counts and latency buckets.
* Add tests covering repeated stats collection.
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