• Add more detail to the client expiration log message.
• Safeguard Lua function calls
• Fix bug where websocket connections were incorrectly terminated (#387).
• Fix breakage of event hook chain in vmq_passwd (#396).
• Lua script balancing for improved Lua hook performance.
• Add descriptions to all available metrics via vmq-admin metrics show --with-descriptions.
• Add Prometheus HELP lines for every metric.
• Add a log message (info level) indicating that connectivity to a remote node
  has been restored.
• Minor changes to the formatting of the tracer output.