<!-- If you need to report a security issue please visit https://github.com/apache/dubbo/security/policy -->

- [ ] 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. -->
<!-- If you just want to request a new feature and discuss the possible business value, create a Feature Request. -->

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
String configContent = dynamicConfiguration.getProperties(configCenter.getConfigFile(), configCenter.getGroup());
                String appGroup = getApplication().getName();
                String appConfigContent = null;
                if (isNotEmpty(appGroup)) {
                    appConfigContent = dynamicConfiguration.getProperties
                        (isNotEmpty(configCenter.getAppConfigFile()) ? configCenter.getAppConfigFile() : configCenter.getConfigFile(),
                            appGroup
                        );
                }
                try {
                    environment.updateExternalConfigMap(parseProperties(configContent));
                    environment.updateAppExternalConfigMap(parseProperties(appConfigContent));
                } catch (IOException e) {
                    throw new IllegalStateException("Failed to parse configurations from Config Center.", e);
                }
            }
            return dynamicConfiguration;
        }
        return null;
    }
    /**
     * Get the instance of {@link DynamicConfiguration} by the specified connection {@link URL} of config-center
     *
     * @param connectionURL of config-center
     * @return non-null
     * @since 2.7.5
     */
    private DynamicConfiguration getDynamicConfiguration(URL connectionURL) {
        String protocol = connectionURL.getProtocol();
        DynamicConfigurationFactory factory = ConfigurationUtils.getDynamicConfigurationFactory(applicationModel, protocol);