qe-chaos-resilience

What this skill does

# QE Chaos Resilience

## Purpose

Guide the use of v3's chaos engineering capabilities including controlled fault injection, load/stress testing, resilience validation, and disaster recovery testing.

## Activation

- When testing system resilience
- When performing chaos experiments
- When load/stress testing
- When validating disaster recovery
- When testing circuit breakers

## Quick Start

```bash
# Run chaos experiment
aqe chaos run --experiment network-latency --target api-service

# Load test
aqe chaos load --scenario peak-traffic --duration 30m

# Stress test to breaking point
aqe chaos stress --endpoint /api/users --max-users 10000

# Test circuit breaker
aqe chaos circuit-breaker --service payment-service
```

## Agent Workflow

```typescript
// Chaos experiment
Task("Run chaos experiment", `
  Execute controlled chaos on api-service:
  - Inject 500ms network latency
  - Monitor service health metrics
  - Verify circuit breaker activation
  - Measure recovery time
  - Document findings
`, "qe-chaos-engineer")

// Load testing
Task("Performance load test", `
  Run load test simulating Black Friday traffic:
  - Ramp up to 10,000 concurrent users
  - Maintain load for 30 minutes
  - Monitor response times and error rates
  - Identify bottlenecks
  - Compare against SLAs
`, "qe-load-tester")
```

## Chaos Experiments

### 1. Fault Injection

```typescript
await chaosEngineer.injectFault({
  target: 'api-service',
  fault: {
    type: 'latency',
    parameters: {
      delay: '500ms',
      jitter: '100ms',
      percentage: 50
    }
  },
  duration: '5m',
  monitoring: {
    metrics: ['response_time', 'error_rate', 'throughput'],
    alerts: true
  },
  rollback: {
    automatic: true,
    trigger: 'error_rate > 10%'
  }
});
```

### 2. Load Testing

```typescript
await loadTester.execute({
  scenario: 'peak-traffic',
  profile: {
    rampUp: '5m',
    steadyState: '30m',
    rampDown: '5m'
  },
  users: {
    initial: 100,
    target: 5000,
    pattern: 'linear'
  },
  assertions: {
    p95_latency: '<500ms',
    error_rate: '<1%',
    throughput: '>1000rps'
  }
});
```

### 3. Stress Testing

```typescript
await loadTester.stressTest({
  endpoint: '/api/checkout',
  strategy: 'step-increase',
  steps: [100, 500, 1000, 2000, 5000],
  stepDuration: '5m',
  findBreakingPoint: true,
  monitoring: {
    resourceUtilization: true,
    databaseConnections: true,
    memoryUsage: true
  }
});
```

### 4. Resilience Validation

```typescript
await resilienceTester.validate({
  scenarios: [
    'database-failover',
    'cache-failure',
    'external-service-timeout',
    'pod-termination'
  ],
  expectations: {
    gracefulDegradation: true,
    automaticRecovery: true,
    dataIntegrity: true,
    recoveryTime: '<30s'
  }
});
```

## Fault Types

| Fault | Description | Use Case |
|-------|-------------|----------|
| Latency | Add network delay | Test timeouts |
| Packet Loss | Drop network packets | Test retry logic |
| CPU Stress | Consume CPU | Test resource limits |
| Memory Pressure | Consume memory | Test OOM handling |
| Disk Full | Fill disk space | Test disk errors |
| Process Kill | Terminate process | Test recovery |

## Chaos Report

```typescript
interface ChaosReport {
  experiment: {
    name: string;
    target: string;
    fault: FaultConfig;
    duration: number;
  };
  results: {
    hypothesis: string;
    validated: boolean;
    metrics: {
      before: MetricSnapshot;
      during: MetricSnapshot;
      after: MetricSnapshot;
    };
    events: ChaosEvent[];
    recovery: {
      detected: boolean;
      time: number;
      automatic: boolean;
    };
  };
  findings: {
    severity: 'critical' | 'high' | 'medium' | 'low';
    description: string;
    recommendation: string;
  }[];
  artifacts: {
    logs: string;
    metrics: string;
    traces: string;
  };
}
```

## Safety Controls

```yaml
safety:
  blast_radius:
    max_affected_pods: 1
    max_affected_percentage: 10

  abort_conditions:
    - error_rate > 50%
    - p99_latency > 10s
    - service_unavailable

  excluded_environments:
    - production-critical

  required_approvals:
    production: 2
    staging: 0
```

## SLA Validation

```typescript
await resilienceTester.validateSLA({
  slas: {
    availability: 99.9,
    p95_latency: 500,
    error_rate: 0.1
  },
  period: '30d',
  report: {
    breaches: true,
    trends: true,
    projections: true
  }
});
```

## Coordination

**Primary Agents**: qe-chaos-engineer, qe-load-tester, qe-resilience-tester
**Coordinator**: qe-chaos-coordinator
**Related Skills**: qe-performance, security-testing