Implementing custom alarms requires an architectural view of observability layers. WHY: Silent failures erode trust; SLA breaches have regulatory and revenue impact. Design a multi-tier stack: (1) COLLECTION—instrument jobs with completion timestamps, data freshness (max(event_ts) per partition), failure counts via CloudWatch/Datadog/Prometheus; (2) THRESHOLD ENGINE—define SLAs (e.g., daily batch by 6 AM) and trigger PagerDuty/SNS; (3) DEPENDENCY CHECKS—upstream sensors block downstream runs....
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