API / Apollo Gateway Interview questions
What is Rover CLI used for?
Rover is Apollo's command-line tool for interacting with a federated graph and with GraphOS. It's the tool teams run in CI and locally to publish, validate, and inspect schemas.
rover subgraph publish– registers a new subgraph schema version with GraphOS.rover subgraph check– validates a proposed schema change against real production traffic before it's published, flagging breaking changes.rover supergraph compose– runs composition locally from a static config file, useful for self-hosted or offline setups.rover graph fetch– pulls down the current supergraph schema for a graph.
In most CI pipelines, rover subgraph check runs on every pull request that touches a subgraph schema, and rover subgraph publish runs after merge to production.
Which Rover command validates a proposed schema change against real production traffic before publishing?
When is rover subgraph publish typically run in a CI/CD pipeline?
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