Feature summary (what you would like to be able to do and where):
Allow configuring a continuous job to have multiple replicas.
Use case(s) (list the steps that you performed to discover that problem, and describe the actual underlying problem which you want to solve. Do not describe only a solution):
Sometimes there's a need to run multiple instances of the exact same thing, for example for multiple runner processes.
Benefits (why should this be implemented?):
Reduces duplicate work.