Blackbox Exporter

The Blackbox Exporter is our tool of choice for monitoring the real-world availability and performance of external and internal endpoints.

Instead of scraping metrics from within an application, it actively probes targets from the outside (using HTTP, HTTPS, DNS, TCP, or ICMP). This ensures our services aren't just running, but are actively responding correctly and quickly to traffic. 🌍⚡

🔌 Primary Modules

While the exporter is highly versatile, our most heavily utilized configuration is the http_2xx module.

When triggered, this module fires off an HTTP GET request to a target URL and strictly expects a successful 200 OK response. It is our standard, battle-tested way of verifying that web services and APIs are up and ready for users.

🚨 Built-in Alerting Capabilities

The Blackbox Exporter goes far beyond simple up/down status checks—it gathers rich metadata during its probes!

For example, when probing HTTPS endpoints, it automatically extracts vital SSL/TLS certificate details. We tap into this native capability to power our CertExpiration alerts.

By comparing the current time against the certificate's expiry timestamp provided by the Blackbox Exporter, Prometheus proactively alerts us well before a certificate expires. Best of all? It does this without requiring any custom exporter logic! 🛡️