MC2 — Department/Person → Action Sankey Diagram

Left: departments, expandable into people (click a department node, its label, or its legend entry). Right: the 20 distinct action types people/agents performed in the log (messaging, file access, room entry, delegation, social posts, ...). Link width is the number of events of that type. Hover a node or link for details, click to pin; click empty space to clear the pin.