They recommend that you subscribe to their downtime-notify group. They post well in advance of scheduled maintenances, and have recently put up a schedule of all such maintenances through the end of the year. It's easy to miss the "you should subscribe here" info though.
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In related news, I am getting CapabilityDisabledExceptions on my AppEngine site, with no warning or explanation.
Edit: Yup, AppEngine is hosed!
http://code.google.com/status/appengine/detail/datastore/200...
Ah, its scheduled maintenence. Would have been good if they put that somewhere on the status page!
They recommend that you subscribe to their downtime-notify group. They post well in advance of scheduled maintenances, and have recently put up a schedule of all such maintenances through the end of the year. It's easy to miss the "you should subscribe here" info though.