identify calls from cloud users

[edublancas]

we're currently logging a True/False variable to identity telemetry events from cloud users. However, we have no way to identify them, making providing support much harder.

we should log another ID that allows us to uniquely identify them. one option is their user ID or email

[edublancas]

note: we're currently logging an email field but it's always none. in the past, we implemented logic to optionally enter a user's email but we removed it.