Building Type-Safe Metrics API in Swift: Part I
Blog post from Sentry
Apple's release of the Cocoa SDK v9.4.0 introduces a new experimental Metrics feature, allowing developers to collect custom measurements for deeper insights into app performance, similar to existing capabilities in other SDKs like Python and JavaScript. The SDK offers three key metric methods: count, gauge, and distribution, which utilize Swift's protocol extensions to provide default values and allow for flexibility in their definitions. This approach aids in minimizing breaking changes in future SDK updates by employing protocols instead of concrete types. The design also introduces type-safe metric units through enums, which can be extended with custom string values using Swift's Associated Values and ExpressibleByStringLiteral protocol, ensuring both compile-time safety and forward compatibility. The article explains these design choices and teases further enhancements, such as handling multiple attribute value types without resorting to type-erased Any, to be discussed in a subsequent part of the series.
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