Disk I/O errors
Kernel logged I/O errors against one or more block devices. Indicates failing storage hardware, a flaky cable/controller, or filesystem corruption. Investigate immediately to prevent data loss.
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.