@jame1997  You can version control Process Groups (PG) into NiFi-Registry.   If a process group were to get deleted, you could reload the last version stored in NiFi-Registry.  With version controlled PGs, anytime a user makes a change to the PG, the PG reports local change exists and allows a quick option to commit new version.  Not only does this version control feature allow you to restore last good stored version from NiFi-Registry, it makes it easy to back out changes to an older stored version.  This would require you to version control the individual PG and not the top level PG to create a NiFi-Registry catalog of all your PGs to facilitate easy rollback, restore, and reuse capabilities. If you are talking about a scenario where you accidentally deleted a PG and noticed right away, you can simply swap in the newest archived flow.json.gz and restart your NiFi to restore. Please help our community thrive. If you found any of the suggestions/solutions provided helped you with solving your issue or answering your question, please take a moment to login and click "Accept as Solution" on one or more of them that helped. Thank you, Matt ... View more

@jame1997  Not much to look at from a NiFi side. NiFi is writing to the network successfully and there is some loss then happening between NiFi and your syslog server.   Resource usage affecting your NiFi would only slow down processing but not result in dataloss within NiFi.  So the PutSyslog would successfully write all bytes to the network before passing the FlowFile to the "success" relationship.  Using TCP of course would allow NiFi to confirm successful delivery thus allowing NiFi to appropriately retry, or route to either failure or success relationships. You could look at the data rate NiFi is writing from the putSyslog by looking at the stats on the processor.  Then maybe you could experiment with: 1. netstat - nsu to check for UDP packet loss.   2. using a network monitoring tool Please help our community thrive. If you found any of the suggestions/solutions provided helped you with solving your issue or answering your question, please take a moment to login and click "Accept as Solution" on one or more of them that helped. Thank you, Matt   ... View more