Cost Control for Your Supergraph

Cost Control is a feature designed to manage the cost of operations within a Supergraph by estimating and, if necessary, rejecting requests that exceed a predetermined cost limit, ensuring optimal resource usage. This feature utilizes the Cosmo Router, which employs a default cost algorithm based on IBM’s GraphQL Cost Directive specification, allowing for customization through @cost and @listSize directives. The estimated cost, calculated statically at planning time, helps prevent overly expensive operations, while the actual cost, which is dynamic and based on real response sizes, can be used for billing purposes. Two operational modes exist: Measuring Mode, which records the estimated cost without rejecting operations, and Enforcing Mode, which actively rejects operations surpassing the cost limit before execution. This system is particularly beneficial for managing complex queries in environments with variable client usage patterns, providing a flexible and efficient way to ensure system stability and cost efficiency.

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