The context or the "label" of the event is a specification to narrow the scope of the event. When someone specifies 'job' they don't normally mean all jobs, so a context is required to determine which job they are describing. A context can be specified in 3 different forms:

    1. pre-defined label
    2. process group label  (see: Job Labels)
    3. job ID

    Pre-defined labels

    selfThis job
    parentThe job referred to by pid




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