Hi @meghanpowers
I don't think there is any metric available in launch however at this point if you and your organization as enterprise customer then you can see this metric through the Adobe Admin Console which is a central location for managing the Adobe entitlements across your organization.
Through Admin console you can able to see the number of users (total and unique) having the Launch product access, user has developer access and many more.
For point number 3,& 4 - There is no direct answers but might be possibility of using Launch API https://developer.adobelaunch.com/api/reference/1.0/libraries/ you can get
- # of releases to production
- Time each library sits in the queue before moving through the publishing flow
Hope this helps.