We architect and deploy a production-grade, sovereign telemetry stack powered by Prometheus, Grafana, and Alertmanager on CentOS Stream 10. We replace hundreds of noisy alerts with actionable Service Level Objectives (SLOs) focused on the Four Golden Signals (Latency, Traffic, Errors, and Saturation), with high-priority notifications routed directly to PagerDuty, Slack, or Telegram.