fix: lost trace content in occasion when shutting down trace

[oldme-git]

Dear review:
在程序结束时要留有时间等待数据上报，不然有时候 otel 服务端会收不到，自建 jaeger 和阿里云都有这个问题。官网的示例也要改一下，不然新手会很疑惑。

[gqcn]

@oldme-git @houseme 不对啊，有个defer shutdown()没起作用吗，感觉是不是看看shuwdown是不是有问题？

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@oldme-git @houseme No, there is a defer shutdown() that doesn't work. Is there something wrong with shuwdown?

[houseme]

@oldme-git @houseme 不对啊，有个defer shutdown()没起作用吗，感觉是不是看看shuwdown是不是有问题？

刚开始直接使用完 shutdown 关闭是有这个问题，后续没有碰到这个问题。

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@oldme-git @houseme No, there is a defer shutdown() that doesn't work. Is there something wrong with shuwdown?

I had this problem when I used shutdown at the beginning, but I didn't encounter this problem later.

[gqcn]

@oldme-git @houseme 不对啊，有个defer shutdown()没起作用吗，感觉是不是看看shuwdown是不是有问题？

刚开始直接使用完 shutdown 关闭是有这个问题，后续没有碰到这个问题。

这里会对使用者造成困惑，是否自己的代码中也需要加上这个sleep语句。为什么示例代码中的shutdown没起作用呢？

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@oldme-git @houseme No, there is a defer shutdown() that doesn't work. Is there something wrong with shuwdown?

There was this problem when I used shutdown directly at the beginning, but I did not encounter this problem later.

This will cause confusion for users, whether they need to add this sleep statement to their own code. Why doesn't the shutdown in the example code work?

[houseme]

这个地方设置了 超时时间，是不是测试环境网络问题，可以调整一下这个时间的值 @oldme-git

gf/contrib/trace/otlpgrpc/otlpgrpc.go

Line 94 in 8669512

ctx, cancel := context.WithTimeout(ctx, time.Second)

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The timeout is set here. Is it a network problem in the test environment? You can adjust the value of this time @oldme-git

gf/contrib/trace/otlpgrpc/otlpgrpc.go

Line 94 in 8669512

ctx, cancel := context.WithTimeout(ctx, time.Second)

[oldme-git]

@houseme @gqcn shutdown 没有处理 tracerProvider.shutdown，导致 trace 不会上报，我不知道这些改会不会带来其他问题，反正现在我测试是可以正常上报数据的

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@houseme @gqcn shutdown does not handle tracerProvider.shutdown, resulting in the trace not being reported. I don’t know if these changes will cause other problems. Anyway, now I can test that the data can be reported normally.