Koa Datadog Metrics Middleware

koa-datadog-middleware is a Koa.js middleware designed for automatically reporting application performance metrics to Datadog via DogStatsD. It specifically tracks response times and request counts, categorizing them by HTTP status code, request path, and HTTP method. The middleware allows for the inclusion of custom tags, either through its initial configuration or dynamically by setting properties on `ctx.state.datadog` for individual requests. It leverages the `hot-shots` library internally for StatsD client functionality but critically overrides some default `hot-shots` configurations. The current stable version, 1.2.1, indicates a mature library focused on a specific integration, with a release cadence that suggests stability over frequent breaking changes. It differentiates itself by providing a ready-to-use Koa integration specifically for Datadog histograms without extensive boilerplate, making it straightforward to add basic observability to Koa applications.