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Describe the proposal

Observability tasks, adding some aggregation indicators such as:

dubbo_provider_rt_milliseconds_min_aggregate
dubbo_provider_rt_milliseconds_avg_aggregate
dubbo_provider_rt_milliseconds_sum_aggregate
dubbo_provider_rt_milliseconds_max_aggregate

dubbo_consumer_rt_milliseconds_min_aggregate
dubbo_consumer_rt_milliseconds_avg_aggregate
dubbo_consumer_rt_milliseconds_sum_aggregate
dubbo_consumer_rt_milliseconds_max_aggregate