classDiagram
    %%
    %% nextflow.trace
    %%
    Session --> TraceObserverFactory : init

    TraceObserverFactory "1" --> "*" TraceObserver : create
    TraceObserver <|-- AnsiLogObserver
    TraceObserver <|-- GraphObserver
    TraceObserver <|-- ReportObserver
    TraceObserver <|-- TimelineObserver
    TraceObserver <|-- TraceFileObserver
    TraceObserver <|-- WorkflowStatsObserver