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NodeHighNumberConntrackEntriesUsed

Meaning

Number of conntrack are getting close to the limit.

Impact

When reached the limit then some connections will be dropped, degrading service quality.

Diagnosis

Check current conntrack value on the node. Check which apps are generating a lot of connections.

Mitigation

Migrate some pods to another nodes. Bump conntrack limit directly on the node, remembering to make it persistent across node reboots.