At my organization we heavily use slashes in branch names (for organizational clarity). For example, our upstream branch is named `development/upstream` . All of the CircleCI features seem to work fine with this, except for the insights page  which just blank screens. After talking to CircleCI support, slashes in branch names are not a support use-case for the insights page.
It would be great to see this support added, and I don't think it would not be a huge change (of course, there is probably some engineering constraint I am not aware of)
 Branch names randomized for anonymity