| Interface | Description | 
|---|---|
| Metrics | Holds metrics data; typically for .profile()-step analysis. | 
| TraversalMetrics | Contains the Metrics gathered for a Traversal as the result of the .profile()-step. | 
| Exception | Description | 
|---|---|
| FastNoSuchElementException | Retrieve a singleton, fast  NoSuchElementExceptionwithout a stack trace. | 
| TraversalInterruptedException | Thrown if a  Traversalis interrupted during execution. | 
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