Recently 2nd FIDE Council online meeting approved the report of FIDE Arbiter's commission. International Arbiter Michael von Keitz was upgraded to category C from category D.
The report itself is very long (16 pages) but on Appendix C (page 14) you can find a list of recommendations for Arbiter's upgrades.

https://arbiters.fide.com/wp-content...lARBReport.pdf

That one can learn from this report:

1. Arbiter's commission received 17 upgrade applications and approved 15 of them - almost 90% approval rate.

2. All but 2 applications were for 1 step of upgrade (from D to C or from C to B or from B to A).

Thanks to Hal Bond for help and advise with this application. Congratulations to Michael von Keitz!