有人会如何编写像 Newrelic 这样的东西，它是低级代码，即内核吗？
你会如何写一些本质上与 newrelic 类似的东西？即监视实时应用程序的东西。
它只是监听通过某些端口的流量并记录它，还是内核级 C/C++ 代码来执行此操作？
寻找所涉及内容的概述，听起来是一个有趣的应用程序编写。
How would you go about writing something similiar in nature to newrelic? i.e. something that monitors a live application.
Is it simply listening to traffic going over certain ports and logging it, or is it kernel level c/c++ code to do this?
Looking for an overview of what's involved, sounds like an interesting application to write.
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New Relic 所做的基础知识相当容易上手。但越深入，事情就越复杂。 New Relic 雇用大量开发人员和 QA 人员是有原因的。
对于 Ruby 和 Rails，您可以阅读包装您的代码的代理的源代码（位于 github 上）。它会让您很好地了解它在做什么。尽管代理相当复杂，但服务器中发生的事情甚至更复杂。
由于我在 New Relic 工作，所以我无法真正深入细节，但如果你环顾四周，你会发现很多技术细节，因为我们过去已经相当公开地讨论过它。
The basics of what New Relic does are fairly easy to get started with. But the deeper you go, the more complicated it gets. There's a reason New Relic employs a lot of developers and QA people.
For Ruby and Rails, you can read the source code of the agent (it's on github) that wraps your code. It will give you a good idea of what it's doing. Although the agent is pretty complex, there is even more complicated stuff going on in the server.
I can't really go into details, since I work at New Relic, but you will find a lot of technical details if you look around, since we've talked about it pretty openly in the past.