Opserver

Originally developed and used by Stack Exchange to monitor their high-traffic sites, ensuring reliability and performance under massive loads, as evidenced by its origins.

Aggregates data from multiple monitoring sources into a single interface, providing comprehensive visibility without the need to switch between different tools, as highlighted in the key features.

Offers full control over data and dashboards, allowing teams to tailor monitoring to specific needs without vendor lock-in, aligning with its value proposition of avoiding licensing costs.

Provides immediate alerts and performance metrics, helping operations teams quickly identify and resolve system issues, as mentioned in the real-time alerts feature.