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Downgrading from selinux-policy 3.13.1-283.35.fc27 to selinux-policy {devel|targeted} 3.13.1-283.34.fc27 solves the problem of having lots of upowerd related seliux alerts. Moreover, suspending a session by closing the laptop lid (lenovo t470) does not work anymore with .35 - laptop stays powered on (except you manually suspend it by commandline)
I've also encountered this issue with updates-testing packages with both Fedora 27 and 28. However, it didn't occur until upower-0.99.8 was pushed in late June. Reverting that version of upower fixed the problem for me in both releases, and I gave karma in Bodhi accordingly. This may be a chicken vs. egg thing, but selinux-policy 3.13.1-283.35.fc27 was pushed to testing a few weeks before upower-0.99.8, and I didn't have any issues in the interim. The upower update states in Bodhi "adds sandboxing", at which point myself and other users started getting SELinux errors and broken suspension. So I'd guess that the upower maintainer perhaps tested using an older version of selinux-policy. As to which maintainer should address this, that I can't say.
closing this bug because of upwer updates solving this problem.
I'm not aware of any upower update that solves the problem? upower-0.99.8 introduced the problem from my perspective. You're saying it fixed it in your case?