At the moment, as part of mobile metrics service, we have a component called `App Metrics`. It 's job is relatively simple: save and aggregate some metrics data and expose them to Prometheus.

However, it is quite an overhead to try to maintain this component. We should like to see that if we can replace it with a Prometheus push gateway instead.

The default version: https://github.com/prometheus/pushgateway doesn't support aggregation, so it might not work for us. We may consider to use this version instead: https://github.com/weaveworks/prom-aggregation-gateway.