lintanghui opened a new issue, #3069:
URL: https://github.com/apache/brpc/issues/3069
**Describe the bug**
clear_stats不是线程安全的，在一个线程周周期执行clear_stats用于情况mvar指标，其他线程不停执行get_stats();然后进行赋值会导致coredump
**To Reproduce**
```
bvar::MultiDimension<bvar::LatencyRecorder> mvar("mvar", {"label1",
"label2"});
std::list<std::string> lables = {"v1", "v2"};
bvar::LatencyRecorder* rec = mvar.get_stats(lables);
// 实际clear_stats是在别的线程执行，处理用于模拟并发操作的情况快速复现
mvar.clear_stats();
*rec << 100;
```
**Expected behavior**
**Versions**
OS:
Compiler:
brpc:
protobuf:
**Additional context/screenshots**
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