An instrumentation system performs operations such as profiling an application and partitioning and distributing units of the application using different versions of metadata describing the application. Performing an operation on an executing application generates overhead. Detailed metadata used in operations such as profiling create unnecessary overhead during other operations. By removing metadata detail unnecessary for a particular operation, an instrumentation system using reduced metadata generates less overhead for that particular operation. Different instrumentation packages include different versions of metadata for performing operations on the application.