ticdc: improve error message when downstream kafka is unavailable #11540
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affects-7.5
good first issue
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severity/minor
type/enhancement
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When downstream kafka is unavailable, kafka sink will try to restart. After several restart, it will report an error like "table sink stuck".
The error message doesn't explain what happened and is useless to help customer to locate the problem, so we need to imporve this error message to explain the cause of the problem.
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