Two days ago has been released in Yammer a new feature called group insight, this new feature, allows you to see engagement metrics for a Yammer group right from the feed.
We know that we have other tools to see the adoption of Yammer like the O365 Content pack, but I think the inclusion of this feature simplify the process of viewing the activity of the group.
So, we can conclude that nowadays the inclusion of collaboration tools inside of a company is vital, but more important is too observe which is the adoption of each one of this tools and be able to take measures if these tools are not being used or have been used poorly.
If you want more information about this new feature, visit the Tech Community post: https://techcommunity.microsoft.com/t5/Yammer-Blog/Measure-and-grow-engagement-with-group-insights-in-Yammer/ba-p/122411