Link speed mismatch
Network interface negotiated a speed below 1 Gbps despite supporting higher. Almost always a physical-layer or autoneg issue; rarely a real config decision.
Remediation
When this rule fires on one of your servers, the dashboard alert detail page renders the full remediation guidance: the command to run, what to verify after, and Furnace's annotation for your specific distro + hardware. Sign in at app.glassmkr.com to see the live alert.