Stability

Flow-control mechanism: downstream signals upstream to slow producers rather than overwhelm consumers; bounded queues vs unbounded; backpressure vs load shedding (internal vs boundary); credit-based flow control; pull-based streams; anti-patterns (unbounded queues, retries defeating backpressure)

Resource partitioning, shuffle sharding, cellular architecture

Closed/open/half-open state machine for downstream resiliency

*Release It! Design and Deploy Production-Ready Software* — Michael Nygard

Transient failure recovery; exponential backoff with jitter; retry amplification in chains; idempotency prerequisite; retry queues

Which stability pattern when; selection decision tree (outgoing call, incoming request, internal pipeline, system edge, automation, resource pooling); pattern × antipattern matrix; composition order (timeout first, then bulkhead, then breaker, then retry, etc.); anti-patterns of pattern composition

Coherent navigation hub for Nygard's stability pattern set; failure-arresting (timeout/circuit-breaker/bulkhead), load-handling (shed load/backpressure/handshaking), defensive (fail fast/let it crash/steady state/retry), and architectural (decoupling middleware/test harnesses/governor); pattern composition; antipatterns they defend against

Bounding wait time on every blocking call; sizing by P99.9; absent-timeout gotchas; relationship to circuit breaker and retry