IPMI SEL full or near-full
The BMC System Event Log is full or near-full. A full SEL silently stops recording new events, so ipmi_sel_critical and the SEL-derived ECC counts go deaf to every future hardware fault. Export the SEL, then clear it so the BMC records again.
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.