You are building an application composed of multiple services, where each service may rely on one or more other services, forming a directed acyclic graph (DAG) of dependencies. One of these services serves as the entry point that receives user requests and, upon receiving a request, calls each of its dependencies. These dependencies then call their own dependencies, and so on.

The load factor of a service is defined as the number of units of load it must handle when the entry point receives 1 unit of load, assuming all upstream services issue their requests simultaneously. When multiple paths lead to the same service, the corresponding loads accumulate.