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You most likely know Java has an agent option (-javaagent). Maybe you've had a go at building your own agent (I covered agent basics in a recent newsletter). Perhaps you've tried attaching to a JVM too, after it has started. But you've probably found that building your own robust full featured agent is too much work. Wouldn't it be nice if someone handled all the complexities of classloading, async comms, etc, and just left you the easy work of instrumenting the specific thing you want to instrument?

Now Elastic has done exactly that. (Note that I currently work on the Elastic APM Java agent). By providing a simple plugin capability to the open source Elastic APM Java agent, you can now essentially build your own fully robust dedicated agent with very little effort! I think that's pretty cool!

Now on to all the usual newsletter list of links, tips, tools, news and articles, and as usual I've extracted all the tips into this month's tips page

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Last Updated: 2022-07-29
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