Troubleshooting as hypothesis testing
On This Lesson 4 topics
This lesson is planned. The outline below lists the topics it will cover. The full lesson has not been published yet.
In this lesson
investigate systematically instead of guessing.
Planned topics
- Loop: observe the symptoms, form hypotheses, pick the cheapest test that separates them, run it, update.
- Write hypotheses and evidence down; it keeps a team aligned and prevents re-testing.
- Stop mitigation and diagnosis from blocking each other: restore service first when safe, but capture evidence (thread dumps, heap, logs) before restarting.
- Beware anchoring: the first plausible cause is often a symptom of a deeper one.
Draft outline details
Demonstration
An investigation log: time | observation | hypothesis | test | result | next. Keep it in the incident channel.
Check your understanding
Why capture evidence before restarting?
Show answer
A restart destroys the state needed to find the cause.
Practice
Apply this lesson with the module's lab, exercises and quiz.
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