Had a hard time last week with a Connections 4 upgrade.
Whenever I tried to install the Connections apps (on a fresh WAS install!) I got an error during metrics ear file creation:
Googling brought me to this technote:
So I had to delete some WAS files and everything worked after that!?
PS: I assume that a failed Fixpack installation at the beginning (of course fixed and reinstalled later on) was the source of the problem