PSU redundancy lost
One or more PSUs are in fault, absent, or degraded state. Single power failure now risks full server outage. Dell BMCs report this via an aggregate sensor; other vendors via per-PSU sensors.
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.