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Runtime variables
Token variables
Global variables
Runtime Variables
runtime['<argument-name>']
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All arguments should be specified within a quote '
Token Variables
token['<plugin-name>']['input'|'output'|'error']
Is a multi-map variable that contains three metrics for each plugin predecessor to the instance of a conditional plugin in the DAG.
Global Variables
global['pipeline'|'namespace'|'logical_start_time'|'plugin'])
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