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Why request timeouts limit waiting but cannot stop cascading failures without admission control, bounded queues, backpressure, and load shedding.

Why read replicas often fail to reduce primary database load when reads are coupled to writes, replica lag triggers fallback, and query cost is misread.

Why retry logic can amplify degraded systems, how retry budgets and jitter reduce retry storms, and what to check before retrying production requests.

How excessive production logging buries signal, increases cardinality, distorts incident timelines, and slows debugging in well-instrumented systems.

How feature flags grow from safe release controls into hidden complexity, and how lifecycle rules, ownership, tests, and cleanup keep them contained.