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all matched attribute names and values ( or value parts if group present ) are joined into into one string and the result is hashed with MD5 algorithm

here is the source:

https://github.com/apache/nifi/blob/main/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/HashAttribute.java#L225

the official HashAttribute documentation:

https://nifi.apache.org/docs/nifi-docs/components/org.apache.nifi/nifi-standard-nar/1.11.0/org.apache.nifi.processors.standard.HashAttribute/

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