Server unreachable
Dashboard has not received a snapshot from this server in 2x the configured collection interval (default 10 minutes). Either the Crucible agent stopped reporting, the network is down, or the server is offline. Alert auto-resolves on next successful snapshot.
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.