PushMessage's servedVariants < totalVariants even though all variants have serverBatches == totalBatches.

This is caused by the counting logic here: https://github.com/aerogear/aerogear-unifiedpush-server/blob/1.1.0-beta.4/push/sender/src/main/java/org/jboss/aerogear/unifiedpush/message/MetricsCollector.java#L96-L107

and can be reproduced with a modified test here: https://gist.github.com/lfryc/12638f604fe567475a67#file-testmetricscollector-java-L129-L172

Notice that collectMetrics is invoked before sending events:

        metricsCollector.collectMetrics(variant1Metric1);
        metricsCollector.collectMetrics(variant1Metric2);
        metricsCollector.collectMetrics(variant2Metric1);

        send(batchLoadedQueue, new BatchLoadedEvent(variantID1), variantID1);
        send(allBatchesLoaded, new AllBatchesLoadedEvent(variantID1), variantID1);

The best resolution is described here: AGPUSH-1512

But as a temporary workaround, we could make client to do the math and recount variants that have servedBatches == totalBatches as well as number of receivers.