Interval deployment metric :: Decide on the baseline

[thisthat]

Question

What should be the previous deployment that we use to compute the deployment interval value?

Context

The question was raised during the following PR: #822 (review)

Recently, we introduced the possibility of restarting a deployment without releasing a new App version.
This raises a question: what should be the baseline that we use to compute the interval between deployments?
the first App version revision or the latest?

[mowies]

The team discussed this and came to the conclusion that the deployment interval shall be between end time of revision 1 of the previous version and the end time of revision 1 of the new version.