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- [ ] I have searched the [issues](https://github.com/apache/dubbo/issues) of this repository and believe that this is not a duplicate.

## Describe the proposal
<!-- Please use this for a concrete design proposal for functionality. -->
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EN:
Observability task, optimizing thread pool index embedding function
1 Need to specify a name for the core thread pool
2 Core thread pool index is not effective
3. Remove the frame-level indicators and only keep the core monitoring indicators (the frame-level code type is completely deleted and will be considered later)

可观测性任务，优化线程池指标埋点功能
1需要为核心线程池指定名称
2核心线程池指标生效问题
3移除框架层指标只保留核心监控指标
}
    public void setApplicationName(String applicationName) {
        this.applicationName = applicationName;
    }
    public String getApplicationName() {
        return this.applicationName;
    }
    public ApplicationModel getApplicationModel() {
        return this.applicationModel;
    }
    public SimpleMetricsEventMulticaster getEventMulticaster() {
        return this.eventMulticaster;
    }
    public void setCollectEnabled(Boolean collectEnabled) {
        this.collectEnabled = collectEnabled;
    }
    public boolean isCollectEnabled() {
        return collectEnabled;
    }
    public MethodMetricsSampler getMethodSampler() {
        return this.methodSampler;
    }
    public ThreadPoolMetricsSampler getThreadPoolSampler() {
        return this.threadPoolSampler;
    }
    public void collectApplication(ApplicationModel applicationModel) {
        this.setApplicationName(applicationModel.getApplicationName());
        this.applicationModel = applicationModel;
        applicationSampler.inc(applicationName, MetricsEvent.Type.APPLICATION_INFO);
    }