Blackbox Exporter: External Probing and Uptime Monitoring
Overview Prometheus’s conventional monitoring is “inside-out” — Prometheus scrapes Exporter metrics to understand internal system state. But when users access your service, they follow an “outside-in” path: DNS resolution → network routing → load balancing → backend service. A link that looks perfectly healthy from the inside may be completely inaccessible to users due to DNS misconfiguration, CDN cache issues, or expired SSL certificates. Blackbox Exporter solves the “external probing” problem....