Security | Threat Detection | Cyberattacks | DevSecOps | Compliance

Picture a cybersecurity team responsible for protecting a classified military installation in a remote operational theater. No internet connection. No cloud services. Classified and unclassified networks running on physically separate infrastructure. Their security information and event management system has to detect threats, correlate events, and generate alerts with zero external connectivity, for the entire deployment. That is not a compliance checkbox. It is a physics problem.

Analyst reports tell you what vendors do. Peer reviews tell you whether it actually works. The Gartner Peer Insights Voice of the Customer for SIEM is built on verified reviews from real security and IT practitioners who bought, deployed, and operated the platforms they rated. No vendor involvement in the scoring. No pay-to-play placement. Just practitioners saying what worked and what did not. Graylog was included in the 2026 edition of that report. Here’s what our users said.