Make sure to tell us:
What version are you upgrading from?
from 9.4 to 9.9 to 10.2
System information (Operating system, Java version, Database provider/version)
What’s the issue you’re facing?
There will be two database migrations to 9.4.0 → 9.9.2 → 10.2.1. Does data size increase migration time like live_measures?