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For new clients, the new `QUOTA_VIOLATED` error code will be used to inform client that a topic has been rejected. The `throttle_time_ms` field be is used to inform the client about how long it has been throttled:

• throttle_time_ms = max(<request throttle time>, min(<throttle time of rejected topics in the request>) <controller throttle time> - <waiting time in the purgatory if applied>)

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For old clients, we can't gracefully reject any topics requests. Therefore, we propose to always accept them and to throttle the client by muting is channel. The throttle time will be computed at the time the client should have waited for. The  The `throttle_time_ms` field will be populated accordingly. For `CreateTopicResponse` and `CreatePartitionsResponse`, we will also populate the `ErrorMessage` to explain that they have been throttled if they wereis used to inform the client about how long it has been throttled:

• throttle_time_ms = max(<request throttle time>, <controller throttle time> - <waiting time in the purgatory if applied>)

The channel will be muted as well when `throttle_time_ms > 0`.

Co-Existence of Multiple Quotas

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