NTP not synced
Either the kernel clock is unsynchronized (critical; drift in progress) OR the NTP daemon has stopped while the clock is still synced (warning; drift will start once kernel state expires).
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.