Data relating to execution flows at a computer system is aggregated across multiple execution flows by categorizing each execution flow into an execution flow shape. The execution flows may represent sequences of software components that are invoked or other computer system resources that are consumed. The execution flow shapes are developed by observing and recording the execution flows at the computer system and applying lossy compression rules. Execution flows are categorized into an execution flow shape which is a closest match. The execution flow data may be aggregated by an agent at the computer system, and communicated to a manager for subsequent use. The aggregation combines the information from all execution flows into a small enough data set that can be reported without consuming unduly large processing overhead while still preserving as many of the interesting aspects of the execution flows as possible.