How I Built a Centralized Monitoring System for 600–700 Servers — Using Open Source Tools

What happens when you're responsible for hundreds of client servers — and have no single pane of glass to see them all? You build one. Managing infrastructure at scale is one of those challenges that seems simple until you're actually doing it. Scattered dashboards, siloed logs, missed alerts — the classic observability nightmare. Here's how I designed and deployed a centralized monitoring and logging stack that now covers over 600 client servers, all from a single control plane on AWS. The Problem Our team manages infrastructure for multiple clients — each with their own servers, environments, and applications. Before this implementation, monitoring was fragmented: each client had different tooling, visibility was reactive, and log investigation meant SSHing into individual machines. We needed something better. The goal: one place to see everything — metrics, logs, alerts — with zero vendor lock-in and minimal cost. The Stack I Chose All open source. All containerized. Deployed on a s