Final answer:
The HR business partner can consider metrics such as turnover ratio, number of grievances, and cost per hire to address employee resignations.
Step-by-step explanation:
As the HR business partner of Ralph, the AVP of infrastructure for a small healthcare consulting company, several metrics can be useful in determining the next course of action regarding employee resignations. One such metric is the turnover ratio, which calculates the percentage of employees who leave the company within a specific period. Another metric is the number of grievances, which reflects any issues or complaints raised by employees. Lastly, the cost per hire is a metric that measures the financial impact of hiring new employees, including recruitment and training expenses.