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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
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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
}
                
                
                if (serviceRefreshState.get() != 0 && instanceRefreshScheduleTimes.get() % 5 != 0) {
                    return;
                }
                try {
                    if (!applicationModel.isDestroyed() && registered) {
                        ServiceInstanceMetadataUtils.refreshMetadataAndInstance(applicationModel);
                    }
                } catch (Exception e) {
                    if (!applicationModel.isDestroyed()) {
                        logger.error(CONFIG_REFRESH_INSTANCE_ERROR, "", "", "Refresh instance and metadata error.", e);
                    }
                }
            }, 0, ConfigurationUtils.get(applicationModel, METADATA_PUBLISH_DELAY_KEY, DEFAULT_METADATA_PUBLISH_DELAY), TimeUnit.MILLISECONDS);
        }
    }
    @Override
    public void increaseServiceRefreshCount() {
        serviceRefreshState.incrementAndGet();
    }
    @Override
    public void decreaseServiceRefreshCount() {
        serviceRefreshState.decrementAndGet();
    }
    private void unregisterServiceInstance() {
        if (registered) {
            ServiceInstanceMetadataUtils.unregisterMetadataAndInstance(applicationModel);
        }