Small SaaS Node.js error alert stack uses grouped exceptions and metrics

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A system for small SaaS applications uses grouped exceptions, key rate metrics, and an external poller for alerts to distinguish isolated failures from broad issues. It recommends retaining fewer raw logs and longer-lived aggregates to manage costs and data volume. The approach includes an external heartbeat monitor for silent failures in scheduled jobs. This design focuses on comparing treatment and control cohorts for reliable rollback decisions.

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