yuluo-yx opened a new issue, #10871:
URL: https://github.com/apache/rocketmq/issues/10871
### Before Creating the Bug Report
- [x] I found a bug, not just a question.
- [x] I searched open GitHub Issues and pull requests and found no duplicate.
- [x] I confirmed that this bug belongs to Apache RocketMQ.
### Runtime platform environment
macOS (Darwin), reproduced with an isolated local unit test.
### RocketMQ version
Branch: develop
Git commit: fd0c95920e0deac96ce2ae27442747cc5e65e930
### JDK Version
Zulu OpenJDK 8 (8.94.0.17)
### Describe the Bug
StatisticsBrief validates only the outer shape of percentile metadata.
Non-positive slot counts, non-increasing range boundaries, and slot counts
wider than their range are accepted. These values can later cause division by
zero, invalid slot calculations, or array-size overflow.
### Steps to Reproduce
1. Construct StatisticsBrief with metadata such as {{10, 0}}, {{10, 2}, {10,
2}}, or {{10, 11}}.
2. Sample a value or calculate the slot count.
3. Observe invalid arithmetic or inconsistent bucket behavior.
### What Did You Expect to See?
The constructor should reject invalid metadata with IllegalArgumentException.
### What Did You See Instead?
Malformed metadata passes validation and fails later in statistics
processing.
### Additional Context
The invalid cases are reproducible with focused StatisticsBrief unit tests.
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