StatsD Metrics Collection

Shopify utilizes StatsD for collecting and visualizing custom metrics, enabling high-level overviews of system performance and aiding in assumption validation. The `statsd-instrument` gem facilitates this by providing metaprogramming methods for injecting instrumentation into various parts of the application, such as Liquid templates, Google Base updates, and Webhook processing. This system is used to track metrics like cache hits/misses, API success/failure rates, and request counts, contributing to improved observability and faster debugging.