[codenlearn]

The 2 metrics I've used in the past is

1. Bounce rate combined with Session length

- Bounce rate can be defined as % of users who leave only after viewing one or few pages. The reason at least I coupled bounce rate with session length is atleast in the app we work there are few personas that prefer to stay in one page for a long period of time and do some interactions. Bounce rate combined with Session length always give us a good picture are folks using the feature(s) as intended. One thing we did was set a baseline metric where we first measured session length on the app as well as per page basis, and after that we could build the bounce rate. Amplitude works well for this case

2. Churn Rate - number of users who stop using the app over a given period. This should be easy to do by querying db if you maintain some session duration information.