[GitHub] [dubbo-go] flycash opened issue #431: Enhancement: Rule based implementation of rate limit.

["flycash (GitHub)" <gi...@apache.org>]

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**What would you like to be added**:

The implementation of rate limit strategy based on rules.
In this implementation, we allow user defines rules when to reject the new quest.

For example, user could define rule "cpu>90" which means that dubbogo should reject the new request if the cpu usage rate is greater than 90%.

The targets:
1. Allow user defines different rule and enable boolean operator, like "cpu > 90 || io>30"
2. The rules could be stored in config center, file system... 

**Why is this needed**:

Even though we have several rate limit strategies, all of them are "static" strategies. They don't make the decision based on the server's current status.

[ Full content available at: https://github.com/apache/dubbo-go/issues/431 ]
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