We can track individual installations as they are updated over the time. The round nodes are the DRBD versions, the number of currently known installations is shown after the comma. The box nodes indicate new nodes.
The edges are labeled with the number of installations there were moved from one DRBD version to another. Such edges are only shown if the edge represents more than 20% of all upgrades that originated from the source node. Edges coming from or going to stray numbers indicate update movements of less then 20% of all updates of that node.
