Hi all, I notice in the Ceilometer V2 web API<http://docs.openstack.org/developer/ceilometer/webapi/v2.html#meters> that it's possible to set a period for meter statistics but I don't quite understand the format of how to do so. In the functional examples section<http://docs.openstack.org/developer/ceilometer/webapi/v2.html#functional-examples> it says to pass URL parameters, but when I send a GET to http://my-vm-hostname:8777/v2/meters/my-meter-id/statistics?period=3600 I get an error that contains faultstring": "unsupported operand type(s) for -: 'NoneType' and 'NoneType'" Can somebody point me to what I'm doing wrong? Thanks, Mark -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.openstack.org/pipermail/openstack/attachments/20131218/f423eb1e/attachment.html>