APM, Application Performance Monitoring System
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CAT 作为服务端项目基础组件，提供了 Java, C/C++, Node.js, Python, Go 等多语言客户端，已经在美团点评的基础架构中间件框架（MVC框架，RPC框架，数据库框架，缓存框架等，消息队列，配置系统等）深度集成，为美团点评各业务线提供系统丰富的性能指标、健康状况、实时告警等。
Daemon for easy but powerful stats aggregation
📊 An infographics generator with 30+ plugins and 300+ options to display stats about your GitHub account and render them as SVG, Markdown, PDF or JSON!
Resilience4j is a fault tolerance library designed for Java8 and functional programming
A declarative JavaScript library for application development using cloud services.
:chart_with_upwards_trend: Capturing JVM- and application-level metrics. So you know what's going on.
An AI-powered next-generation open source real-time observability system.
An application observability facade for the most popular observability tools. Think SLF4J, but for observability.
JavaMelody : monitoring of JavaEE applications
Lightweight analytics abstraction layer for tracking page views, custom events, & identifying visitors
Prometheus instrumentation library for JVM applications
Headless Chromium-based web performance metrics collector and monitoring tool
SIMD-accelerated distances, dot products, matrix ops, geospatial & geometric kernels for 16 numeric types — from 6-bit floats to 64-bit complex — across x86, Arm, RISC-V, and WASM, with bindings for Python, Rust, C, C++, Swift, JS, and Go 📐
Fast scalable time series database
Powerful Analytics Solution. Setup in 30 seconds. Display all your data on a Simple, AI-powered dashboard. Fully self-hostable and GDPR compliant. Alternative to Google Analytics, MixPanel, Plausible, Umami & Matomo.
API Observability. Trace API calls and Monitor API performance, health and usage statistics in Node.js Microservices.
CSS selectors complexity and performance analyzer
(UNMAINTAINED) inspectIT is the leading Open Source APM (Application Performance Management) tool for analyzing your Java (EE) applications.
Detects smells and computes metrics of Java code
📈 Minimalistic zero-dependencies statsd client for Node.js
Expose AWS Cloudwatch Metrics as a public HTML page using AWS Lambda and server-side rendering
Vert.x implementation of a Hystrix Events Metrics Stream