tsdb

In https://github.com/taosdata/TDengine/blob/develop/src/client/src/tscPrepare.c, Local variable loopCont is assigned only once, to a constant value, making it effectively constant throughout its scope. If this is not the intent, examine the logic to see if there is a missing assignment that would make loopCont not remain constant.

So the 1567th line should be removed.
![image](https://user-im

Describe the bug

Currently keys written to server.conf go undetected.

This means that not only typos go undetected, but lack of validation is a risk during version migration as settings that used to apply in a previous version have no effect in a newer one without warning -- even if new settings are supposed to be used.

To reproduce

• Create a key with a typo.
• Watch the QuestDB

示例

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• 地点：北京
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• 使用场景和经验分享：你们最看重夜莺的哪些功能，解决一个什么样的问题，以及使用规模和范围，使用夜莺监控构建企业级监控体系的过程中，有哪些好的经验分享。
• 需求建议：希望哪些点上夜莺监控能做的更好，更契合您的使用场景。

In grafana/mimir#790 we've removed metric.Metric in favour of model.Metric. The next step could be just moving to labels.Labels in MetricsForLabelMatchers() instead of model.Metric. This could also save some memory allocations due to type casting.