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Executable tutorial hand-in: Diagnosing HTTP Service Errors with Prometheus and PromQL #3133

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Executable tutorial hand-in: Diagnosing HTTP Service Errors with Prometheus and PromQL #3133

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Add tutorial proposal: Diagnosing HTTP Service Errors with Prometheus…
sund02 Sep 29, 2026
85bf2cd
Add submission links for tutorial artifact
sund02 Oct 5, 2026
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Merge remote-tracking branch 'origin/2026' into tutorial-prometheus-p…
sund02 Oct 5, 2026
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Merge upstream/2026, keep submission links
sund02 Oct 5, 2026
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Move submission links into Description, drop extra heading
sund02 Oct 5, 2026
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2 changes: 2 additions & 0 deletions contributions/executable-tutorial/jafarm-elenapan/README.md
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Expand Up @@ -19,6 +19,8 @@ Diagnosing HTTP Service Errors with Prometheus and PromQL

## Description

**Tutorial:** [Killercoda](https://killercoda.com/sund02/course/killercoda) — **Source:** [GitHub](https://github.com/sund02/promql-http-error-diagnosis)

This tutorial teaches how to investigate an operational failure in a running HTTP service using application metrics and PromQL. We observe healthy traffic, introduce a controlled failure, diagnose the affected endpoint, and verify recovery using Prometheus.

By the end of the tutorial, we will be able to: explain how an instrumented application exposes metrics and how Prometheus collects them; distinguish cumulative counters from request rates; write PromQL queries for request rate and error ratio grouped by endpoint; use metric labels to locate a failing endpoint and confirm recovery; and explain the limitations of metrics-based diagnosis.
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