HTTP Metrics Middleware

http-metrics-middleware is an Express.js middleware designed to integrate Prometheus metrics into Node.js applications, currently stable at version 2.2.1. It provides a convenient wrapper around `prom-client`, offering a set of default HTTP request metrics such as duration histograms and summaries, as well as status code counts. The library maintains a regular release cadence, primarily driven by dependency updates, security patches, and minor enhancements. Key differentiators include its configurable options for metric labels, such as normalized URL paths, and custom time/quantile buckets, allowing fine-grained control over the collected data. While primarily built for Express, it can be seamlessly integrated into Koa applications using `koa-connect`. It focuses on providing a robust, opinionated solution for common HTTP metrics without requiring extensive manual setup of individual `prom-client` metrics.