CodingLevel 5
Observability
Easynot started
Mediumnot started
Hardnot started
StatusFormatCompany style
Easy
Cron job failed silentlyOn-call incidentOn-call incident15 minLogs missing from pods on one nodeOn-call incidentOn-call incident15 minError alert reports no data after a library upgradeOn-call incidentOn-call incident15 minPager fires for staging trafficOn-call incidentOn-call incident15 minUptime check fails from one probe locationOn-call incidentOn-call incident15 minMedium
Synchronous logging blocking request threadsOn-call incidentOn-call incident30 minSnowflake password in CI logsOn-call incidentOn-call incident30 minBackup upload silent failureOn-call incidentOn-call incident30 minSecrets logged at scaleOn-call incident · Stripe styleStripe styleOn-call incidentStripe style30 minTreatment revenue per user dropsOn-call incident · Netflix styleNetflix styleOn-call incidentNetflix style30 minModel calibration decays without retrainingOn-call incident · Meta styleMeta styleOn-call incidentMeta style30 minHard
Identity provider token endpoint downOn-call incidentOn-call incident40 minRCE exploitation at scaleOn-call incidentOn-call incident50 minCardinality explosion in metrics backendOn-call incidentOn-call incident40 minStateless JWT allows post-logout accessOn-call incidentOn-call incident40 minExfiltration tuned under DLP thresholdOn-call incidentOn-call incident45 minFeature skew online offlineOn-call incident · Google styleGoogle styleOn-call incidentGoogle style35 minLabel freshness reads zeroOn-call incident · Stripe styleStripe styleOn-call incidentStripe style35 minGray failure disk awaitOn-call incident · Amazon styleAmazon styleOn-call incidentAmazon style40 min