I was able to reproduce the issue by simulating a cluster with a number of hosts that does not have an exact integer square root, and tested the fix in the same way. Sorry for any incovenience.
Merge remote branch 'upstream/master'
Fix for issue 212. The load distribution heatmap would fail to be cre…
…ated for clusters with a number of hosts that did not have an exact integer square root.
Yes. 3.5.12 has just been released.