As we transition from Lucidchart to draw.io for team diagramming, this guide outlines the steps to integrate draw.io and PlantUML with GitLab. I'll configure the Diagrams.net server, enable integration, and demonstrate creating and editing diagrams within GitLab. Additionally, I'll cover the setup and integration of PlantUML for creating detailed design diagrams. Follow along to seamlessly incorporate these powerful diagramming tools into your GitLab workflow.