@wffger2 @cotopaul The InstanceIdentifier was introduced when NiFi switched from using the flow.xml.gz to the flow.josn.gz for flow persistence. It is also currently being written to the flows stored in the NiFi-Registry. I say "currently" because this jira exist and is still open: https://issues.apache.org/jira/browse/NIFI-11321 So as @cotopaul points out, the "instanceIdentifier" will be unique for each instantiation of the flow definition, but the "identifier" will be the same. Downside here is every time you want to do a comparison, you'll need to download latest flow definition from DEV and UAT environments and compare for difference based on the Identifiers. Thanks, Matt
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