Update From Prior Version: https://libreqos.readthedocs.io/en/latest/docs/v2.0/update.html Installation Guide For New Installs: https://libreqos.readthedocs.io/en/latest/

We’re excited to share LibreQoS 1.5-RC3. This build focuses on smoother circuit changes, richer SQM control, better observability, and a pile of stability fixes to keep nodes happy in the field.

Since winning “Product of the Year” at Wispapalooza, we’ve had quite the influx of users – so we’ve been busy tracking down corner cases and issues people run into. We’ve also been hard at work making Insight even better – we’re especially excited by the new AI-powered support ticket helper system (which will get even better next week!).

The next RC will feature a greatly improved LibreQoS API (integrated into Insight), and some more UI improvements.

• Bakery v3 and circuit changes

• New binpacking and sorting reduce reload churn and avoid unnecessary HTB tree changes.

• Dynamic circuit updates keep IP mappings around, so reloads are lighter and faster.

• Transactional speed changes (temporary circuit → swap → cleanup) keep shaping active and minimize packet loss during edits.

• Hierarchical binpacking bugs fixed; flat-network edge cases handled; planner fairness scoring refined and exposed in the affinity view.

• Guardrails: 0 Mbps entries now fall back to defaults; ignore obviously defaulted circuits; sentinel 1000 weight override is handled explicitly.

• SQM and queueing

• ShapedDevices.csv can set SQM per direction (cake/fq_codel/none) and defaults remain unchanged when you omit it.

• Optional config bumps very fast circuits to fq_codel automatically; SQM mode none is available when you truly want it off.

• Fq_codel statistics are now tracked and displayed in the web UI; the node manager editor can override the SQM column directly.

• UI and observability

• Top Uploaders view highlights heavy senders.

• CPU affinity viewer shows how workloads pin across cores.

• Live sankey now renders two layers for clearer traffic flow.

• Urgent issues channel surfaces emergency alerts from external systems on the node manager display.

• UI tabs refresh, shaped devices editor now saves correctly, and websocket connections verify http/https prefixes to avoid silent failures.

• Login editor keeps existing passwords when the field is left blank; default config keeps always_overwrite_network_json true for predictable reloads.

• Performance and reliability

• Faster IPv4 handling and no double flow lookups on ICMP/UDP traffic.

• Heimdall memory leak fixed; 2-way flow submission no longer grows without bound.

• HTB bakery order tightened; control-channel timeouts and device-weight calls relaxed to cope with slower nodes; flat-network binpacking and hierarchy issues corrected.

• Build and tooling hardening: Ubuntu 25.10 Clang build fix, mold linker removed due to instability, build scripts tolerate missing services, and MQ setup ordering corrected.

• Integrations, tests, and docs

• UISP integration retains raw JSON for easier troubleshooting.

• Expanded integration tests cover generated PNs, IP mapping, speed overrides, and cake RTT overrides to prevent regressions.

• Quickstarts, configuration, troubleshooting, and design docs refreshed; copyright year now updates automatically.

Many thanks to NLNet for funding the transactional circuits system.