Tag: NATS

The NATS server has emitted an Authorization Violation log entry, meaning a client attempted to connect, publish, subscribe, or perform another operation for which it lacks permission. Intermittent violations often point to misconfiguration or start-up chaos. However, sustained or widespread violations can signal credential expiry or missing secrets.

The NATS server has emitted an Permission Violation log entry, meaninga client attempted to publish or subscribe to a subject for which it lackspermission.

The NATS server is configured to publish messages with payloads that mayexceed the recommended maximum of 8 MB (the server’s default hard limitis 1 MB but it can be raised to 64 MB). Large messages put disproportionate pressure on broker memory, network buffers, and client back-pressure mechanisms.This warning signals NATS is at risk of degraded throughput, slowconsumers, and forced connection closures intended to protect clusterstability.

Detects high-availability failures in NATS JetStream clusters due to:

• Monitor goroutine failure — after node restarts, Raft group fails to elect a leader
• Consumer deadlock — using DeliverPolicy=LastPerSubject + AckPolicy=Explicit with low MaxAckPending
• Unsynced replicas — object store replication appears healthy but data is lost or inconsistent between nodes

These issues lead to invisible data loss, stalled consumers, or stream unavailability.

Detects NATS JetStream storage exhaustion conditions when streams reach configuredstorage limits (maximum bytes, maximum messages) causing message storage failures.These patterns indicate insufficient stream storage capacity relative to messageproduction rate, leading to message rejection and potential data loss.

Detects NATS server connection exhaustion where the configured maximumconnection limit is exceeded, preventing new clients from establishingconnections. This represents a critical messaging infrastructure failurethat can cause cascading outages across distributed systems.

Detects NATS connection failures and network partitions that can impact message delivery and system reliability.