[ejboy]

Following a discussion on Discord, this PR adds a community tutorial on monitoring a Javalin application with StatLite.

The walkthrough uses Javalin’s Micrometer plugin and a small JSON adapter to show request counts, HTTP errors, average latency, JVM heap, and process CPU history. It links the complete runnable example and integration guide, and includes a dashboard screenshot.

Demo polling uses 10 seconds, with a clear note recommending 30 seconds or longer for production. The example was validated locally, and the rendered tutorial was checked on desktop and mobile.

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[tipsy]

Thanks @ejboy, nice work :)

A few things before merging:

• Could you mention in the intro that you maintain StatLite? I think that's fair to readers.
• I'd rather not link to the experiments repo, since it could move or change. Could you add a license and put just the javalin-micrometer example in its own repo? I can create javalin/javalin-statlite-example for it, like we did for the minecraft tutorial. It would also be nice to have the core of StatLiteMetrics inline in the tutorial.
• I think it could be a fair bit shorter. The 30s/production note shows up a few times, and the statlite.yaml → sed → statlite-demo.yaml setup is a bit confusing. Wouldn't it be simpler to show the demo config and mention 30s once? 🤔

Small thing: the screenshot is ~2900px and 440KB, could you resize it a bit?

[ejboy]

Hi @tipsy. Thanks for the thoughtful review! All points make sense to me.

• I'll mention that I maintain StatLite in the introduction.
• I'd be happy to move the runnable example to javalin/javalin-statlite-example. I also just added an MIT license to our experiments repository. For the new repo, either Apache 2.0 or MIT works for me, whichever you prefer.
• I'll include the core of StatLiteMetrics inline, keeping the full implementation and maintained integration guide linked.
• I'll simplify the tutorial and use 30-second polling throughout. The original demo used shorter intervals to speed up testing, but that introduced unnecessary configuration complexity.
• I'll resize the screenshot.

One question about the example repository: would you be comfortable granting me collaborator access with permission to merge updates? I don't need ownership, but I'd be happy to help maintain the example as Javalin or StatLite evolves. Of course, I'm also fine contributing through PRs if that's your preferred workflow.

[ejboy]

I've addressed the feedback in the latest revision, including simplifying the configuration, adding the inline adapter code, and resizing the screenshot.

The overall diff is slightly larger because I included the core of StatLiteMetrics inline, as requested. The actual setup and instructions are now simpler and less repetitive.

The remaining step is moving the runnable example to javalin/javalin-statlite-example, as discussed. I'm happy to handle the migration once the repository is created.