What key metrics are you measuring for your shared services centers supporting HR Operations processes like Payroll, Time & Attendance, Employee Enquiry management, Separations, Employee Data Management?

for People Life Cycle processes (exc payroll and time & attendance), focusing on employee data management, we are measuring the following KPIs :
1) executive KPIs

- Hire on time (= completed in Workday on the effective date at the latest) 
- change job on time (= promotion, change of manager, ...)
- change job manager self service %
- termination on time
2) operational KPIs :
- change job processing time (below 4 days)
- manager satisfaction relating to change job process

We have a service level agreement for shared services. As far as I'm aware processing times is the only, or certainly the main, metric. Other measures could be around accuracy and compliance with legislation/policies but the most important thing here is to keep it simple and minimise the number of metrics to those that really matter.