Netflix has announced that it has successfully migrated its mobile applications to Federated GraphQL from a monolithic Falcor API, using a range of testing and migration strategies. In a blog post, the company discussed the three strategies it used to carry out the migration without any disruption to users: AB Testing, Replay Testing, and Sticky Canaries. Netflix also shared the broadly applicable techniques used beyond GraphQL to perform the migration, including using replay testing to ensure idempotent APIs were migrated correctly and relying on metrics-based testing for non-functional requirements like caching and logging user interaction.
https://netflixtechblog.com/migrating-netflix-to-graphql-safely-8e1e4d4f1e72?gi=4217a3fd9c5c