Testing in production with feature flags, canary deployments, synthetic monitoring, and chaos engineering. Use when implementing production observability or progressive delivery.
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Testing in production with feature flags, canary deployments, synthetic monitoring, and chaos engineering. Use when implementing production observability or progressive delivery.
// Progressive rollout with LaunchDarkly/Unleash patternconst newCheckout = featureFlags.isEnabled('new-checkout', {
userId: user.id,
percentage: 10, // 10% of usersallowlist: ['beta-testers']
});
if (newCheckout) {
return<NewCheckoutFlow />;
} else {
return<LegacyCheckoutFlow />;
}
// Instant rollback on issuesawait featureFlags.disable('new-checkout');
Canary Deployment
# Flagger canary configapiVersion:flagger.app/v1beta1kind:Canaryspec:targetRef:apiVersion:apps/v1kind:Deploymentname:checkout-serviceprogressDeadlineSeconds:60analysis:interval:1mthreshold:5# Max failed checksmaxWeight:50# Max traffic to canarystepWeight:10# Increment per intervalmetrics:-name:request-success-ratethreshold:99-name:request-durationthreshold:500
Production is the ultimate test environment. Feature flags enable instant rollback. Canary catches issues before 100% rollout. Synthetic monitoring detects problems before users. Chaos engineering builds resilience. RUM shows real user experience.
With Agents: Agents monitor production, replay incidents as tests, run chaos experiments, and convert production insights to pre-production tests. Use agents to maintain continuous production quality.
