Version 0.8.0 introduces three major additions. First, a complete WLDT Monitoring System, a new it.wldt.monitoring package providing a pluggable, handler-based metric infrastructure that is automatically injected into every DT component and tracks a rich set of framework-native metrics out of the box. Second, Augmentation Function refinements: a unified result-handling type, explicit state tracking for stateful functions, and full monitoring integration at the augmentation layer. Third, a WldtEventBus thread-safety fix that eliminates a ConcurrentModificationException under concurrent publish/subscribe.

Key Updates:

• New MonitoringInterface system: One per DigitalTwin, automatically injected into the Model, Adapters, Augmentation Functions, and Storage. It is opt-in per component and extensible through the MonitoringInterfaceHandler
• 5 metric types: WldtCounter, WldtUpDownCounter, WldtGauge, WldtTimer, and WldtHistogram, all with a fluent mutation API and snapshot semantics for callbacks
• Framework-native metrics: Automatic tracking of latency, success/error counts, and state transitions for the DT Model, Physical Adapters, Digital Adapters, Storage, and the DT life cycle, without any developer action
• Augmentation monitoring integration: The AugmentationFunction base class gains built-in monitoring support, with the handleMetricsRegistration() hook for custom function-level metrics
• AugmentationFunctionResultList: A unified return type for augmentation function executions, carrying either a list of results or an error
• Stateful function state tracking: isRunning() on StatefulAugmentationFunction and new query methods to check if a stateful function is running
• Event Bus fix: Thread-safety improvement of the WldtEventBus under concurrent publish/subscribe

This release also introduces breaking changes in the Augmentation Function API (e.g., the removal of StatelessAugmentationListener). Please check the changelog before upgrading.

For detailed information about these changes and their impact, please refer to the information provided:

• Official Changelog

Details about the new features:

• Monitoring Interface
• Augmentation Functions
• DT Events

Stay tuned for more updates!