Verification and test of accuracy and practicability of indicators

- [ ] 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

EN:
At present, there are some monitoring indicators. The accuracy and practicability of the indicators need to be further verified and tested. Normal scenarios, abnormal scenarios and extreme scenarios should be considered during the verification. Relevant indicators will be listed gradually as shown below.

中文：目前已经存在了一些监控指标，指标的准确性与实用性需要进一步的验证与测试，验证的时候要考虑正常场景，异常场景和极端场景等，相关指标如下所示会逐渐列举。

| Metrics Name | Description |
| ------------------------------ | ------------------------ |
| dubbo_thread_pool_max_size | Thread Pool Max Size |
| dubbo_thread_pool_largest_size | Thread Pool Largest Size |
| dubbo_thread_pool_thread_count | Thread Pool Thread Count |
| dubbo_thread_pool_queue_size | Thread Pool Queue Size |
| dubbo_thread_pool_active_size | Thread Pool Active Size |
| dubbo_thread_pool_core_size | Thread Pool Core Size |
| | |

| Metrics Name | Description |
| ------------------------------------------------ | ---------------------------------- |
| dubbo_consumer_rt_milliseconds_sum | Sum Response Time |
| dubbo_consumer_rt_milliseconds_p99 | Response Time P99 |
| dubbo_consumer_rt_milliseconds_avg | Average Response Time |
| dubbo_consumer_rt_milliseconds_last | Last Response Time |
| dubbo_consumer_requests_processing | Processing Requests |
| dubbo_consumer_rt_milliseconds_max | Max Response Time |
| dubbo_consumer_rt_milliseconds_p95 | Response Time P95 |
| dubbo_consumer_requests_succeed_aggregate | Aggregated Succeed Requests |
| dubbo_consumer_requests_succeed_total | Succeed Requests |
| dubbo_consumer_requests_total | Total Requests |
| dubbo_consumer_rt_milliseconds_min | Min Response Time |
| dubbo_consumer_requests_total_aggregate | Aggregated Total Requests |
| dubbo_consumer_qps_total | Query Per Seconds |
| dubbo_consumer_requests_failed_total | Total Failed Requests |
| dubbo_consumer_requests_timeout_total | Total Timeout Failed Requests |
| dubbo_consumer_requests_failed_total_aggregate | Aggregated failed total Requests |
| dubbo_consumer_requests_timeout_failed_aggregate | Aggregated timeout Failed Requests |

| Metrics Name | Description |
| ----------------------------------------- | --------------------------- |
| dubbo_provider_requests_total | Total Requests |
| dubbo_provider_rt_milliseconds_avg | Average Response Time |
| dubbo_provider_rt_milliseconds_sum | Sum Response Time |
| dubbo_provider_requests_total_aggregate | Aggregated Total Requests |
| dubbo_provider_requests_succeed_total | Succeed Requests |
| dubbo_provider_qps_total | Query Per Seconds |
| dubbo_provider_requests_processing | Processing Requests |
| dubbo_provider_rt_milliseconds_p99 | Response Time P99 |
| dubbo_provider_requests_succeed_aggregate | Aggregated Succeed Requests |
| dubbo_provider_rt_milliseconds_p95 | Response Time P95 |
| dubbo_provider_rt_milliseconds_max | Max Response Time |
| dubbo_provider_rt_milliseconds_min | Min Response Time |
| dubbo_provider_rt_milliseconds_last | Last Response Time |

| Metrics Name | Description |
| ---------------------------------------------- | ------------------------- |
| dubbo_register_rt_milliseconds_max | Max Response Time |
| dubbo_register_rt_milliseconds_avg | Average Response Time |
| dubbo_register_rt_milliseconds_sum | Sum Response Time |
| dubbo_register_rt_milliseconds_min | Min Response Time |
| dubbo_registry_register_requests_succeed_total | Succeed Register Requests |
| dubbo_registry_register_requests_total | Total Register Requests |
| dubbo_register_rt_milliseconds_last | Last Response Time |

| Metrics Name | Description |
| ------------------------------------- | --------------------- |
| dubbo_metadata_push_num_succeed_total | Succeed Push Num |
| dubbo_push_rt_milliseconds_sum | Sum Response Time |
| dubbo_push_rt_milliseconds_last | Last Response Time |
| dubbo_metadata_push_num_total | Total Push Num |
| dubbo_push_rt_milliseconds_min | Min Response Time |
| dubbo_push_rt_milliseconds_max | Max Response Time |
| dubbo_push_rt_milliseconds_avg | Average Response Time |

| Metrics Name | Description |
| ---------------------------- | ---------------------- |
| dubbo_application_info_total | Total Application Info |

EN : The test cases are described as follows:

Question 1:
dubbo_ consumer_ rt_ milliseconds_ Sum index
Time-out scenario: At present, there is statistical response time for normal response, and when there is an exception, such as timeout, the response time should also be counted.
Normal scenario: multiple consumer scenario indicator names are overwritten (metadata request indicators and demoService case requests are mutually overwritten)

中文：测试案例说明如下
问题一：

dubbo_consumer_rt_milliseconds_sum指标

超时场景：在正常响应目前是有统计响应时间的，出现异常的时候例如超时时这个响应时间也是要统计的。

正常场景：指标数据不会增加，可能是多个消费者场景指标名字被覆盖（元数据请求指标和demoService案例请求相互覆盖）

Start by locating the code and tests that emit and aggregate dubbo_consumer_rt_milliseconds_sum and the listed consumer, provider, registry, metadata, and thread-pool metrics. Exercise normal, timeout, exception, extreme, and multiple-consumer scenarios, including metadata and demoService requests. Done means the metric values and names remain accurate without overwriting and timeout response time is included.

Written by the indexing model from the issue text.