Replace API Synthetics with Traffic Replay

UI synthetic monitoring effectively validates public uptime and end-to-end user journeys but generally identifies only that a user-facing flow has failed, leaving engineers to manually locate the responsible backend service. The passage argues that API-level synthetic checks for individual microservices can reduce incident triage time by isolating failures to specific services and endpoints, but notes that conventional scripted API tests are costly to maintain, limited in scenario coverage, and prone to drift as APIs change. It presents Speedscale’s traffic-replay approach as an alternative that captures production requests and responses, replays them deterministically on schedules or after deployments, compares results with recorded baselines, and alerts teams when service behavior changes. This approach is positioned as complementary to UI synthetics, load testing, and chaos engineering, with UI tests covering user journeys while scheduled API replay provides per-service regression validation and failure localization.

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