Increase the metric of topic current limit time

[lightzhao]

Is your feature request related to a problem? Please describe.
When a topic is set to current limit, it is currently uncertain whether it is restricted and how long it has been restricted. I hope that an metric can be added to the broker to view the specific current limit.

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[mattisonchao]

Could i work on it ? @hangc0276

[hangc0276]

@mattisonchao Thanks for you help, I have assigned it to you.

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