(Bloomberg) Colm Kelleher whipped up a storm at the end of last year when the UBS Group AG chairman warned of a dangerous bubble in private credit. As investors dive headfirst into this booming asset class, the more urgent question for regulators is how anybody could even know for sure what it’s really worth.Most Read from BloombergApple to Wind Down Electric Car Effort After Decadelong OdysseyA Spike in Heart Disease Deaths Since Covid Is Puzzling ScientistsOffice Tower Deal for $1 Reveals A