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Description of problem:
This is a QEMU-specific problem. The value of the guest-stats-polling-interval property should survive migration but it can't be done on the QEMU side due to technical limitations.
libvirt has code to set the property on QEMU startup (qemuProcessSetupBalloon) but it doesn't seem to be sending it over to the destination as part of VM migration. Please correct me if I'm wrong.
The statistics period is always formatted in the XML (if set):
http://libvirt.org/git/?p=libvirt.git;a=blob;f=src/conf/domain_conf.c;h=c8c4f61cda69dbae2338324a6d5ae95a04050784;hb=HEAD#l21625
and qemuProcessLaunch() which in turn unconditionally calls qemuProcessSetupBalloon() is called on migrations as well.
I've also tried it and libvirt set the 'guest-stats-polling-interval' property and qemu reported success in setting it.
Looking at the history it seems that this was present since we initially added the support for this feature.