Engineering blog

Announcement / 1 August 2026

1 min read

FluxMQ v0.50.0: Cluster Reliability Fixes, Event Hooks, and Atom Integration

FluxMQ v0.50.0 fixes etcd watch gaps and session-lease recovery for clustering, adds event hooks, deterministic retained-message matching, and isolated AMQP principals for Atom.

FluxMQ v0.50.0: Cluster Reliability Fixes, Event Hooks, and Atom Integration
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Ready

FluxMQ v0.50.0

FluxMQ v0.50.0 is out, focused on clustering reliability and broker hardening, alongside new extensibility and integration points.


What’s New

Event hooks. FluxMQ now supports hooks, letting external systems react to broker events without modifying the broker itself.

Cluster reliability fixes. Two clustering bugs are fixed: nodes now recover their session lease and re-register ownership keys after an expiry instead of losing state, and a gap in etcd watch handling that could silently drop cluster state is closed.

Deterministic retained-message matching. Retained message matching is now deterministic and complete, so subscribers reliably get the retained messages they should for a given topic filter.

Atom integration for audit publishing. FluxMQ adds isolated AMQP local principals scoped specifically to Atom’s audit publishing, keeping audit event traffic separated from other broker traffic.

Broker hardening. Local-principal capability is now derived from a client’s roles rather than its listener, and a new badger close guard prevents issues during shutdown.


Get It

FluxMQ v0.50.0 is available now.

Issues, feedback, and contributions are welcome.

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