Nothing required certification. But certification programs are useful for management because they give you a floor level on the expertise you are buying. That

Nothing required certification. But certification programs are useful for management because they give you a floor level on the expertise you are buying. That's why all (?) enterprise software that has customization/administration has certification programs (eg https://training.linuxfoundation.org/full-catalog/ https://training.linuxfoundation.org/full-catalog/)