The Tree view is composed by two parts: the menu bar and the tree view area:
...
The tree content
The tree content is dynamic. The users can expand/collapse any node (link or issue) to show/hide it. By default 1 depth level is loaded. However the user can increase the auto-expand value up to 4 levels (Server/DC), and up to 3 levels (Cloud).
...
By moving the mouse over the icons and texts, tooltips are brought up showing additional information:
...
The link nodes display the link name and their tooltips show the link type.