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New Relic is an observability platform covering application performance monitoring, infrastructure, logs, and browser monitoring. UK engineering teams see response times, error rates, and transaction traces in one dashboard with AI-assisted alerting. The free tier includes 100GB of data/month; paid plans start around $49/month per user. It integrates with AWS, Kubernetes, and 500+ technologies. GDPR compliance includes EU data residency options. New Relic suits UK scale-ups that want full-stack visibility; smaller teams often start with Sentry and a lighter metrics setup.