Connection Guard 0.5.1 is a maintenance release for Paper/Spigot, BungeeCord/Waterfall and Velocity.

• Fix Velocity bStats initialization with the verified project ID 22913. The injected factory is bundled in the JAR, the Metrics instance stops on shutdown, and statistics failures leave connection checks active. The global bStats opt-out is respected.
• Make clean optional-addon builds independent of the unavailable upstream Maven path by pinning the unchanged, hash-verified MIT LimboAPI 1.1.26 compilation archive. The API is excluded from runtime JARs.
• Add canonical website links and update README branding.
• Add a reproducible developer benchmark suite with actual-JAR policy, provider-failure and recovery gates in CI. It is a development tool, not a new detection algorithm or a claim of measured performance superiority.
• Synchronize asynchronous webhook test fixtures with their worker before assertions; production webhook behavior is unchanged.

Upgrade: stop the server/proxy, replace the main JAR with connection-guard-0.5.1-all.jar and restart. Keep only one main JAR. Existing configuration and the Cloud protocol/defaults are unchanged.

Cloud is optional and on by default. Disable it with cloud.enabled: false, /cg cloud disable or CONNECTIONGUARD_CLOUD=false. Plugin privacy disclosure.

Qualification: 431 regression tests including loopback Redis, reproducible main/addon archives, packaging/version-history guards and artifact-bound benchmark checks. The final JAR is checked for startup/help/reload/shutdown on Paper 1.21.11-132, Velocity 3.4.0-566, Paper 26.3-151, Folia 26.2-7, Velocity 4.2.0-30 and 4.2.1-SNAPSHOT-36. Current Paper/Folia builds are beta builds; Velocity 4.2.1 is a development snapshot. The actual Velocity bStats factory, service ID and collectors are verified with telemetry disabled; live bStats ingestion is not established. Exact qualification scope and limits.

Compatibility metadata includes stable Minecraft releases through 26.3 and Hangar Velocity entries through 4.2.1. These selected checks do not prove every intermediate version or authenticated account/login scenario.

Download and docs: https://connectionguard.net/download