Draft post of the first challenge

content/posts/20250116-first-observability-code-challange/index.md

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+---
+title: "Application Observability Code Challenge 1"
+date: 2025-01-15T12:44:23Z
+pin: true
+draft: true
+
+resources:
+  - src: "**.{png,jpg,webp}"
+    title: "Image #:counter"
+
+tags:
+  - Grafana
+  - Observability
+  - OpenTelemetry
+  - AOCC
+  - Java
+
+slug: aocc-challenge-01
+
+summary:
+  The first of the Application Observability Code Challenges is now available. A simple Spring Boot application with a REST endpoint implemented in Jersey/JAX-RS
+  This application has some unexpected behaviour. Can you find out what is happening based on the observability data? Can you improve the observability to prove that a fix really fixed the problems?
+---
+
+![Application Observability Code Challenge 1](aocc_challenge01_small.png)
+
+The first challenge of the Application Observability Code Challenges is now available.   
+See the [announcement blog](../application-observability-code-challenges) for more information about the challanges in general.
+The goal is to have fun and learn in the first place.
+
+> 🚨 **Challenge**:
+> - Run the sample application
+> - Run the tests to see what happens
+> - Try to find out what is happens, make a hypothesis❗
+> - **Improve the observability** of the application to **prove the hypothesis**
+> - Optional: fix the problem and **prove it with observability data that it is really fixed**
+> - Optional, but highly appreciated 🙏: Share your findings, insights you learned and potential solution, either as a ['discussion'](https://github.com/cbos/application-observability-code-challenges/discussions) or as a pull request
+
+### Run local or with an online environment
+All details of the challenge are available at [https://github.com/cbos/application-observability-code-challenges/tree/main/challenge-01](https://goto.ceesbos.nl/ghch01)
+An online guided environment is available with KillerCode, see [https://killercoda.com/observability-code-challenges](https://goto.ceesbos.nl/aocckk)
+
+### Challenge details
+
+- The sample application is a simple Spring Boot application with a REST endpoint implemented in Jersey/JAX-RS.
+- The application is instrumented using OpenTelemetry auto instrumentation.
+- You can either run the application with Docker or directly.
+- K6 load scripts are prepared to run tests that provide more insight into the issues.
+
+The setup looks like this:
+![Setup](k6_application_setup.png)
+
+After running one of the scripts you can get more details in a Grafana dashboard like this:
+![K6 dashboard](k6_highload_dashboard.png)
+
+In this screenshot you can see that the application is reaching a limit for some reason, more load does not give more requests per second and with more load the response times increase a lot.
+
+Go to the challenge: [https://github.com/cbos/application-observability-code-challenges/tree/main/challenge-01](https://goto.ceesbos.nl/ghch01)
+
+### Feedback?
+
+If you have any feedback, please let me know. You can leave a comment below, send me a message on Bluesky, Mastodon, LinkedIn or in the ['discussion'](https://github.com/cbos/application-observability-code-challenges/discussions) section of the challenge's Github repository .
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