[RFC] Adaptive automatic flow control

[sczyh30]

Issue Description

Type: feature request

Describe what feature you want

It would be perfect if we can introduce intelligent mechanisms that do adaptive flow control automatically based on real-time metrics. Thus the services can react to burst traffic timely and become more resilient. Users might not need to configure rules anymore.

[yunfeiyanggzq]

@sczyh30 I see some prs are related to this issue like 1007.So I want to know if there are some problems with this proposal or if there is still some work to be done in asoc2020