Conntrack table near full
Linux nf_conntrack table is at or above 75% capacity. At 100%, new connections are silently dropped; services appear to work but new clients can't connect. Critical band (>=90%) means dropping is imminent.
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.