DevOps Practitioner · Module 7: Applied observability and SLOs · Lab
Compute SLI and Error Budget, Justify the Alert Decision
50 min hands-on · Advanced
A local machine with the provided fixture event series (labeled fixtures, small modular dataset). No production data anywhere.
Local guide: run the steps below on your own machine in order, then check the validation list.
Objectives
- Compute the SLI ratio from the given series
- Compute budget consumed and remaining against the stated SLO
- Write the page-or-ticket decision with user-impact justification
Step 1
Compute the SLI
From the fixture series, count valid events and good events, compute the ratio, and compare against the stated SLO. Show the arithmetic, not just the answer.
Step 2
Spend the budget on paper
Compute budget consumed and remaining, project exhaustion at current burn with the month remainder, and separate fast-burn windows from slow-burn trend.
Step 3
Decide and justify
Write the alert decision: page the fast burn with its runbook first action, ticket the trend, and delete-or-keep one symptom alert with a quoted reason. Every number labeled fixture.
How to confirm it worked
- SLI arithmetic shown from the series
- Budget remaining with projection quoted
- Page-or-ticket decision justified by user impact
- Symptom alert handled with a quoted reason