I was unable to find any documentation on this as well, but I have requested it here:
As you have figured out, System Users are users required either by add-ons or used by Atlassian Staff to troubleshoot your instance. They do not take up a license seat.
I hope this helps! Let us know if you have any additional questions.
Hey Community mates! Claire here from the Software Product Marketing team. We all know software development changes rapidly, and it's often tough to keep up. But from our research, we've found the h...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs