Implement self defence metrics in Android SDK.
Follow documentation for metrics extension

This depends on the work in https://issues.jboss.org/browse/AEROGEAR-1902.
However, that is likely to be taken on at the same time (sprint) as this work.
Coordination will be needed between both teams.

How

See https://github.com/aerogear/aerogear-ios-sdk/tree/master/docs/metrics for pattern of how metrics can be collected.
This depends on the investigation in AGDROID-730