The 'Usage Overview' page presented to a cloud admin via Horizon times out when a cloud has a) a large number of tenants and b) a large number of instances.
We saw this during scale testing with 500 tenants and anything over about 25,000 instances.
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: openstack-dashboard 1:2014.1-0ubuntu1
ProcVersionSignature: User Name 3.13.0-24.47-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
Date: Wed Jun 18 09:20:19 2014
PackageArchitecture: all
SourcePackage: horizon
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.apache2.conf.available.openstack.dashboard.conf: [modified]
modified.conffile..etc.openstack.dashboard.local.settings.py: [modified]
mtime.conffile..etc.apache2.conf.available.openstack.dashboard.conf: 2014-06-12T10:32:39.742143
mtime.conffile..etc.openstack.dashboard.local.settings.py: 2014-06-12T10:32:39.710143
I'm aware of this behavior happening in earlier versions of Horizon - I do need to double check that it happens on the latest code.
As an ugly workaround this panel can be disabled in a large environment.