According to this page(https://developers.google.com/analytics/devguides/reporting/data/v1/api-schema), I could get by 'crashFreeUsersRate' metrics by 'platform' dimension. And it really works well.
However there are multi apps in my project, like android-A, android-B, android-C, iOS-A, iOS-B, how can I get 'crashFreeUsersRate' metrics with special app?
I tried to use dimension-filter, but it only accepted exist dimension.