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Tag: Quorum

Loss or degradation of cluster quorum in distributed systems.

IDTitleDescriptionCategoryTechnologyTags
CRE-2025-0020
High
Impact: 10/10
Mitigation: 6/10
Self-hosted PostgreSQL HA: WAL Streaming & HA Controller Crisis (Replication Slot Loss, Disk Full, Etcd Quorum Failure)Detects high-severity failures in self-hosted PostgreSQL high-availability clusters managed by Patroni, Zalando, or similar HA controllers. This rule targets catastrophic conditions that break replication or cluster consensus: - WAL streaming failures due to missing replication slots (usually after disk full or crash events) - Persistent errors resolving HA controller endpoints (etcd/consul) and loss of HA controller quorum - Disk saturation leading to WAL write errors and replication breakagePostgreSQL High AvailabilitypostgresqlHigh AvailabilityPatroniZalandoEtcdReplicationWALStorageQuorumCrashData LossTimeout
CRE-2025-0092
High
Impact: 0/10
Mitigation: 9/10
Redpanda Quorum LossDetects when a Redpanda node becomes isolated (heartbeats fail) and triggers a Raft re-election, indicating quorum loss.Redpanda High AvailabilityredpandaRedpandaRaftQuorumLeader Election