Monument Info
The Monument Info panel belongs to Rust's own monuments. Every monument prefab of Rust has this information on it, and the map generator reads it. The panel shows when you select one of Rust's monuments on a map.
The panel has no fields to edit. It has one button, Snap to tunnel grid, which shows only when the monument has a train tunnel entrance. Click it to move the monument so its entrance lands on the tunnel grid. The move is an undo step. See Dungeon Info (Tunnels) for the grid.
Your own monuments set the same information in the Map Generation panel.
Can edit several selected objects at once.