LagLens

LagLens is a web app (with optional lightweight desktop/CLI agent) for monitoring and diagnosing database replication health across mixed environments (Postgres, MySQL, SQL Server, MongoDB, and common cloud-managed variants). It focuses on the ugly, real-world problems teams actually face: silent replication lag, schema drift, missing rows, and “it’s green but data is wrong” incidents. The product pulls low-level signals (WAL/binlog positions, replica apply rates, conflict counters, heartbeat tables) and correlates them with infrastructure events (deploys, failovers, network blips). Instead of generic dashboards, it provides incident-ready narratives: what changed, when lag started, which tables are diverging, and the most likely root causes with suggested checks. It also includes guardrails like replication SLOs, alert deduplication, and runbook links so on-call engineers can act fast. This is a traditional app with AI-assisted diagnostics (optional).