Prometheus Client for Node.js - prom-client

prom-client is a Prometheus client for Node.js that facilitates the collection and exposure of application metrics.

Key features:

• Supports multiple metric types - including histograms, summaries, gauges, and counters.
• Aggregation of metrics - allows for the collection of metrics across multiple worker processes using Node.js's cluster module.
• Default metrics collection - includes Node.js-specific metrics like event loop lag and garbage collection.
• Custom metrics configuration - enables users to define their own metrics with specific naming and help descriptions.

This library is particularly useful for developers looking to monitor the performance and health of their Node.js applications in a Prometheus-compatible way.