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。
- apm
- java
- distributed
- realtime
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QuestDB is a high performance, open-source, time-series database
- time-series
- low-latency
- database
- sql
flink learning blog. http://www.54tianzhisheng.cn/ 含 Flink 入门、概念、原理、实战、性能调优、源码解析等内容。涉及 Flink Connector、Metrics、Library、DataStream API、Table API & SQL 等内容的学习案例，还有 Flink 落地应用的大型项目案例（PVUV、日志存储、百亿数据实时去重、监控告警）分享。欢迎大家支持我的专栏《大数据实时计算引擎 Flink 实战与性能优化》
APM, (Application Performance Management) tool for large-scale distributed systems.
- apm
- monitoring
- performance
- agent
Production-safe dynamic tracing and diagnostics for Java applications—attach to live JVMs with no restart or recompilation.
- btrace
- java
- bytecode-instrumentation
- diagnostics
🦎 A lightweight, streaming-native, multi-protocol gateway for AI, APIs, and real-time data. Route LLM requests across providers, govern MCP tools, and connect Kafka, MQTT, and HTTP through one high-performance engine with shared security and observability.
Minimalist Java framework for rapidly creating scalable, containerless, RESTful microservices. Ship a production-quality, headless, RESTful API in the shortest time possible. Uses Netty for HTTP, Jackson for JSON, Metrics for metrics, properties files for configuration. Sub-projects and plugins enable, NoSQL, Swagger, Auth0, HAL integration, etc.
A Prometheus Listener for Apache JMeter that exposes results in an http API
- jmeter-plugin
- prometheus
- prometheus-exporter
- jmeter
Java Structured Logging API for Logback, Log4J2, and JUL
- logging
- logback
- structured-logging
- slf4j
An access log implementation to be used in vert web routes - inspired by apache / tomcat access log configuration