Module 11 Summary

What this module established

The timeline usually contains a finding more actionable than the bug: if the metric lagged the user, fixing that shortens every future incident while fixing the bug only prevents this one.

Carry forward

• Write the test for the root cause, not the symptom. The useful test is the one that would have failed in CI before the change shipped.
• Blameless does not mean actionless. End with owned, dated changes or the review has altered nothing.
• Deployed means it ran once; fixed means the metric held for weeks. Set the review date when you close the incident.

Before moving on

Move on when your last incident produced a root-cause test that would have failed in CI, and a four-week check that the fix held.

Mark complete