Customers on cluster 10 are probably noticing errors and sporadic downtime on their sites. We’ve got our admins looking into this as of right now.
As soon as we know what’s going on, we’ll have an update for you here.
Update: Everything’s back to normal on cluster 10. We were affected by a simple runaway script that caused a handful of the servers to spaz out. Since we distribute the load between servers, not every customer on this cluster was affected – but enough were that we figured we’d make a note of it.