delei opened a new pull request, #3642:
URL: https://github.com/apache/hertzbeat/pull/3642
## What's changed?
When monitoring historical data, if the collector encounters a timeout
exception, the following exception information is seen in the log file.
```bash
2025-08-07 22:13:45.307 [metrics-task-timeout-monitor-0] ERROR
org.apache.hertzbeat.collector.dispatch.CommonDispatcher Line:166 - [Collect
Timeout]:
org.apache.hertzbeat.common.entity.message.CollectRep$MetricsData@5eb8d171
2025-08-07 22:13:45.333 [540024518491648-dolphinscheduler-overview-5320]
ERROR org.apache.hertzbeat.collector.dispatch.WorkerPool Line:48 - [Important]
WorkerPool workerExecutor has uncaughtException.
java.lang.StringIndexOutOfBoundsException: begin 0, end -1, length 6
at java.base/java.lang.String.checkBoundsBeginEnd(String.java:4601)
at java.base/java.lang.String.substring(String.java:2704)
at
org.apache.hertzbeat.collector.dispatch.MetricsCollect.transformCal(MetricsCollect.java:425)
at
org.apache.hertzbeat.collector.dispatch.MetricsCollect.lambda$calculateFields$0(MetricsCollect.java:259)
at
java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
at
java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1625)
at
java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
at
java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
at
java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:921)
at
java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at
java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:682)
at
org.apache.hertzbeat.collector.dispatch.MetricsCollect.calculateFields(MetricsCollect.java:261)
at
org.apache.hertzbeat.collector.dispatch.MetricsCollect.run(MetricsCollect.java:223)
at
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
at
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
at java.base/java.lang.Thread.run(Thread.java:833)
```
I tracked this issue and fixed this potential
`StringIndexOutOfBoundsException`.
## Checklist
- [x] I have read the [Contributing
Guide](https://hertzbeat.apache.org/docs/community/code_style_and_quality_guide)
- [x] I have written the necessary doc or comment.
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