The OVH server for attestation.app lost connectivity today but it's available again after triggering a reboot in the OVH web console. I think it only ended up being unavailable for a few hours since I noticed quickly. It was still running but without internet access...
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I still need to find some time to overhaul the interface and email alert system. The server is what needs most of the work. The app is already complete other than maintenance, incorporating future attestation changes and making scheduled remote attestation option more visible.
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I'll be making a new maintenance release of the Android app in the near future incorporating some non-critical library updates, support for more devices with valid attestation samples submitted and an update of the API level to Android P which should be trivial with no changes.