At some point I was surprised to see that my C: Drive on the production server was filling up rapidly ?
After a quick analysis I saw that the reason was 40 Gb of msoidtrace tracing log files ?
After checking a bit deeper I could see that these where coming from the AD Sync Services we had installed lately.
After applying the proper registry keys
And restarting the service “Microsoft Online Services Sign-in Assistant”
The problems where gone
Read more here.