AWS DevOps Engineer Professional
942 incident response problems that help with AWS DevOps Engineer Professional prep.
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All problems (942)
CICD-162A release gate reads a stale error budget snapshot during a failover rehearsalThe canary automation evaluates lagged data and promotes or blocks on the wrong signal. Normal traffic masked the issue until the standby or alternate path became active under rehearsal conditions.CI/CDAdvanced18 minProCICD-264A self-hosted runner image refresh changes the Docker builder version and breaks layer cache reproducibility across the fleet during a failover rehearsalBuilds still run, but cache keys and layer outputs diverge between old and new executors. Normal traffic masked the issue until the standby or alternate path became active under rehearsal conditions.CI/CDAdvanced18 minProCICD-1188Artifact download job failsA public suggestion for safer parallel uploads was applied to the build job. The deploy stage still assumes the old artifact contract and now fails after download.CI/CDIntermediate18 minProCICD-139Canary analysis compares the old metric label after a service rename and promotes a release on meaningless dataThe statistical gate still returns a verdict, but it is evaluating the wrong stream after an observability label migration.CI/CDAdvanced18 minProCICD-1214Dependency restore is green but the cache came from the default branch and masked the real package changeThe run is fast and healthy, yet tests behave strangely because restore keys pulled a broader cache than the branch-specific lockfile warranted.CI/CDIntermediate18 minProCICD-1205Required branch check appears twiceA job rename from public cleanup advice made the pipeline easier to read. Branch protection now appears to require two near-identical checks and blocks merges unexpectedly.CI/CDIntermediate18 minProCICD-324A canary approval checks HTTP success while the job queue depth quietly rises behind the scenes and the release passes on the wrong health dimension during a failover rehearsalUser-facing requests look fine, but asynchronous backlog is already proving the release is unhealthy. Normal traffic masked the issue until the standby or alternate path became active under rehearsal conditions.CI/CDAdvanced19 minProCICD-216A final approval signs one manifest while the deploy job renders a different object set during a failover rehearsalReview and execution diverge because mutation still happens after signoff. Normal traffic masked the issue until the standby or alternate path became active under rehearsal conditions.CI/CDAdvanced19 minProCICD-145A phased rollback restores traffic routing but leaves the message queue schema on the new version, and old workers poison retry trafficUser-facing paths look recovered, yet asynchronous paths still speak the newer contract and create delayed instability.CI/CDAdvanced19 minProCICD-547A preview environment uses feature flags from production defaults and hides...A preview environment uses feature flags from production defaults and hides... focuses on ci-cd-workflow-debugging and asks the reader to isolate Permission Denied in AWS. 실무에서는 ci-cd-workflow-debugging 문제를 볼 때 실패 단계만 보지 말고 최근 변경, 이미지 태그, 시크릿 주입, 롤백 가능 여부를 먼저 함께 확인하는 편이 빠릅니다.CI/CDIntermediate19 minProCICD-258A rollback restores application code while feature migration flags remain enabled in the old environment during a failover rehearsalThe binary path moves backward and the runtime behavior still follows the newer feature contract. Normal traffic masked the issue until the standby or alternate path became active under rehearsal conditions.CI/CDAdvanced19 minProCICD-180A rollback restores the app path but leaves an asynchronous contract on the newer version during a failover rehearsalUser-facing traffic recovers while queue consumers, workers, or webhooks still run with incompatible assumptions. Normal traffic masked the issue until the standby or alternate path became active under rehearsal conditions.CI/CDAdvanced19 minProCICD-300A rollout job waits for one migration task while a second schema-affecting job starts from another workflow in parallel during a failover rehearsalThe database change path appears serialized, yet another automation lane mutates the same contract at the same time. Normal traffic masked the issue until the standby or alternate path became active under rehearsal conditions.CI/CDAdvanced19 minProCICD-1222Artifact download is green but the promoted package is staleA release workflow pulls the most recent successful artifact and later deploys code that never existed on the current branch.CI/CDIntermediate19 minProCICD-1195Artifact retention expires before promotion and the delayed release job downloads nothingA promotion workflow fails days later because the build artifact lifecycle is shorter than the release approval cycle.CI/CDIntermediate19 minProCICD-1190Branch protection still waits on an old workflow name after the pipeline was renamedPull requests cannot merge even though the new workflow succeeds, because branch protection is still requiring a stale status check name.CI/CDIntermediate19 minProCICD-1213Private submodules still failToken-based checkout works, yet private submodules still attempt SSH and fail.CI/CDIntermediate19 minProCICD-1198Pull request preview deploy never startsA repository copied branch protection and preview deployment ideas from community posts. The required deployment check still points to a workflow that only runs on push.CI/CDIntermediate19 minProCICD-1207Required check keeps waiting after a reusable workflow refactor even though the pipeline is greenRuns are healthy, but merges remain blocked because branch protection still watches the old check identity after the reusable workflow change.CI/CDIntermediate19 minProCICD-1217Workflow passes on hosted runners but fails on self-hostedA workflow that looked portable breaks only after the team routes it to self-hosted infrastructure.CI/CDIntermediate19 minPro