Reliability Advanced
Overload Control Room
Control queue growth, adaptive concurrency, health probes, and priority-aware load shedding during overload.
- Time
- 9-12 minutes
- Concept
- Backpressure and overload control
Backend concept
Production Reliability
Failure isolation, graceful degradation, retries, overload protection, observability, queues, and recovery behavior.
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Key takeaway
Failure isolation, graceful degradation, retries, overload protection, observability, queues, and recovery behavior. Start with the related games below when you want to turn the definition into practice.
Why this matters
Reliable backend systems keep core user flows working even when dependencies and traffic misbehave.
How to practice
Practice protecting capacity, preserving correctness, and recovering with evidence.
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Learning objectives
- Keep accepted work within bounded capacity.
- Separate liveness from traffic readiness.
- Reserve capacity for critical work during overload.
- Allocate dependency budgets within an end-to-end deadline.
- Cancel abandoned work promptly.
- Isolate optional workloads and design bounded fallbacks.
Common mistakes to avoid
- Using unbounded queues.
- Failing liveness for dependency outages.
- Retrying all rejected work immediately.
- Giving every hop the full client timeout.
- Ignoring client cancellation.
- Sharing one unbounded pool across workloads.
Games for Production Reliability
Start with the first game, then use local review history to revisit missed decisions.
Reliability Advanced
Deadline & Isolation Simulator
Propagate deadlines, cancellation, bulkheads, and bounded fallbacks across dependency failure windows.
- Time
- 9-11 minutes
- Concept
- Deadline propagation and failure isolation
Observability Advanced
SLO Incident Commander
Direct incident response with RED, USE, service-level indicators, burn rates, and explicit recovery criteria.
- Time
- 9-12 minutes
- Concept
- Service objectives and incident command
Reliability Intermediate
Circuit Breaker Clinic
Diagnose dependency failures and choose circuit breaker, timeout, fallback, retry, half-open, and bulkhead strategies that reduce blast radius.
- Time
- 6-9 minutes
- Concept
- Circuit breakers, timeouts, retries, fallbacks, and dependency isolation
Reliability Intermediate
Observability Incident Triage
Triage production incidents by choosing useful metrics, logs, traces, queue signals, database evidence, request ids, and alerting strategies.
- Time
- 6-9 minutes
- Concept
- Production observability, incident triage, metrics, logs, traces, and alerts
Queues Intermediate
Message Queue Simulator
Tune workers, retries, and dead-letter behavior while jobs move through an async queue with failures and poison messages.
- Time
- 7-11 minutes
- Concept
- Async jobs, retries, visibility timeout, and dead-letter queues
Scaling Intermediate
Load Balancer Challenge
Route simulated traffic across backend servers using round robin, weighted round robin, least connections, and random strategies.
- Time
- 6-10 minutes
- Concept
- Load balancing strategies