Explore what are the errors per token you can receive. See if you can use them for metrics - invalid token, invalid app and so on. [Code here|https://github.com/aerogear/aerogear-unifiedpush-server/blob/master/push/sender/src/main/java/org/jboss/aerogear/unifiedpush/message/sender/AdmPushNotificationSender.java#L72] |
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