1. A method, including: receiving at least one rule specification for a graph-based computation having data processing components connected by linking elements representing data flows, the rule specification defining rules that are each associated with one or more rule cases that specify criteria for determining one or more output values that depend on input data; generating a transform for at least one data processing component in the graph-based computation based on the received rule specification, including providing an interface for configuring characteristics of a log associated with the generated transform; and transforming at least one data flow using the generated transform, including: tracing execution of the data processing components in the graph-based computation at run time, generating log information based on the traced execution according to the configured log characteristics, and storing or outputting the generated log information.