Worked on the elsa-core repository to implement CorrelationId support for the NewBookmarkQueueItem model, enhancing workflow observability and traceability within the Elsa runtime. The solution involved propagating the CorrelationId through components such as StimulusSender and BookmarkFilter, ensuring end-to-end correlation for workflow items. The implementation was designed to be non-breaking, with clear documentation indicating that the CorrelationId is optional and only present when available. This backend development effort, using C# and focusing on workflow orchestration, improved debugging and analytics capabilities by enabling more granular tracking of correlated workflows without disrupting existing functionality or introducing breaking changes.