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不要通过环境变量来控制在不同环境下的tracing行为
这种控制消耗很大，随着rust 1.57.0版本发布，可以使用自定义cargo profile的方式来实现
cargo profile可以做： Enable costlier tracing/logging/debug on staging builds, or force LTO only for production builds.
为何不要用环境变量来控制tracing库的行为: If your app is in any way performance sensitive you are carrying a significant cost for that.