We've found an issue with Opsview's iOS push notifications where the push server certificates which are used to authenticate with Apple's Push Servers had expired. This expired on Saturday 7th September at 12:41:10 GMT. The service was restored on Monday 9th September at 08:59 GMT.
All messages sent during this time were forwarded to Apple but were not received on devices.
Please accept our apologies for this break in service and we have put steps in place to stop it occuring again.