How SRE Teams Use Traffic Shadowing for Safe Testing

In this episode of The Site Reliability Podcast, Lucas and Luna explore traffic shadowing: a technique that lets SRE teams test new services with live production traffic without affecting real users. They break down how GitHub used shadowing to validate a new caching layer without risking customer data, and how Stripe employs it to test payment processing changes safely. Lucas explains the difference between shadowing, canary deployments, and A/B testing, and walks through the infrastructure needed — request duplication, isolation, and metric comparison. Luna asks about the risks of shadowing, including latency impact and data privacy concerns. The hosts also discuss how shadowing can detect subtle issues like race conditions and silent errors that canary deployments might miss. A practical, concrete episode for SREs looking to reduce deployment risk. #TrafficShadowing #SRE #SiteReliabilityEngineering #SafeTesting #ProductionTesting #GitHub #Stripe #CanaryDeployments #IncidentPrevention #Observability #Technology #FexingoBusiness #BusinessPodcast #ProductionEngineering #Latency #DataPrivacy #RaceConditions #DeploymentRisk Keep every episode free: buymeacoffee.com/fexingo