resilience

Rapid function scaling can overwhelm a shared dependency. Concurrency limits, reserved capacity and queue buffering are the containment toolkit.

Four tiers, four bills. Stating RTO and RPO per tier turns a vague resilience wish into a decision leadership can actually price, and the testing story is where candidates fold.

Every candidate can define chaos engineering. Far fewer can say what they would break first, and almost none volunteer the abort condition, which is the thing that makes it a programme rather than an incident.

Monitoring dies silently: stuck alert queues, full TSDBs, collectors killed inside the same blast radius. Layer independent checks and a heartbeat so absence of signal pages louder than any red dashboard.

A two-second dependency should cost you latency, not three services. The mechanics are arithmetic: Little's law plus retry amplification. The fix is a budget, not a ban.

The outage window closed, but every process born since then still tries to fetch secrets at boot with nothing to fall back on. Why restarts keep reopening an incident that already ended.

Break-glass exists to restore login when the identity provider is the thing that died. Few accounts, sealed hardware factors, an alert on every authentication, a printed runbook and a quarterly drill.

A model provider is a single dependency with a shared failure domain across every customer they have. Treating it like a database you cannot fail over from is how a product goes down for four hours.