A DLQ checked weekly is a graveyard

A medium Pipeline Design interview practice problem on DataDriven. Write and execute real pipeline design code with instant grading.

Domain

Pipeline Design

Difficulty

medium

Problem

A DLQ checked weekly is a graveyard. The section's reframe: the DLQ is a leading-indicator quality signal. A spike in validation failures means an upstream producer changed schema; a spike in auth failures means a credential expired; a steady drip of timeouts means a downstream is degraded but not yet outage-class. Diagnose the DLQ pattern by adding three monitoring pieces: a transform that computes per-second arrival rate broken down by exception type, a metric storage destination, and an alert destination that fires on z-score deviations above the rolling baseline.

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