Cloud datastore has 99.95% monthly uptime SLA for multi-region which translates to slightly above 20 minutes per month. Is this downtime likely to happen all at once or intermittently? What kind of errors are to be expected during the downtime? I am trying to figure out the strategy required to be put in place on how the app should respond to end users during the downtime. Would it be possible that it works for data related to some users but not the others at a given time? I am looking for a best practice guidance for an app that is expected to be usable 24/7 with graceful downgrading based on the underlying services. For example, if the downtime is intermittent, users might just reload the page and won't even know something wrong happened. But if the downtime is prolonged, explicitly displaying that the system is currently inaccessible and asking them to visit after sometime might be better.
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