{"repo":"kanagaabishek/lumen","free":true,"listed":false,"github":"https://github.com/kanagaabishek/lumen","clone":"git clone https://github.com/kanagaabishek/lumen.git","description":"Self-hosted distributed tracing system. Collects OpenTelemetry spans, analyzes critical paths and bottlenecks. Single command deployment.","language":"Java","stars":10,"topics":["cassandra","cassandra-database","distributed-tracing","distributed-tracing-analytics","grpc","java","microservices","observability","opentelemetry"],"license":"MIT","category":"analytics","readme_excerpt":"Lumen — Distributed Trace Analysis System What is Lumen? Lumen is a self-hosted distributed tracing system that collects, stores, and analyzes traces from your microservices. It tells you not just what happened in a request — but exactly where time was lost, which service caused the slowdown, and what the critical path through your system looks like. What Problem Does It Solve? In a distributed system, a single user request can touch 10 different services. When that request is slow or fails, finding the root cause means manually correlating logs across all 10 services — which can take hours. Lumen solves this by: - Collecting spans from every service automatically via OpenTelemetry - Reconstructing the full request tree showing parent-child relationships - Computing the critical path — the chain of spans that determined total duration - Identifying the bottleneck span — the single operation consuming the most time - Detecting gaps — periods where a service was idle between calls A request that took 450ms is no longer a mystery. Lumen shows you: \"74% of time was spent in inventory-service → SELECT FROM products. Everything else was fast.\" Who Uses It? Any team running microservices who wants to understand latency without paying for Datadog or New Relic. Lumen is self-hosted — your trace data never leaves your infrastructure. Architecture UI A built-in trace explorer is available at http://localhost:8080 after starting with docker-compose up . No separate deployment needed. - B","default_branch":null,"files":null,"tree":[],"storefront":"/r/kanagaabishek","claimed":false,"request_supported":{"post":"https://gitbuyer.com/r/kanagaabishek/lumen/request-supported","requests":0},"note":"indexed from public GitHub; nothing is for sale on this page. Clone it from GitHub. Paid listings live at /search."}