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There are a couple of options persisting either alarm or history configurations and they are documented in the following How/To's:

MQTT Alarms

MQTT History

Unable to Resolve?

If the troubleshooting tips did not help you resolve your issues, please open a ticket with Support making sure to include the MQTT Engine logs as appropriate.  

From the Ignition Logs view, select the Download icon to download a copy of the system-name.idb file to your local file system. You will need to compress (zip, 7z or rar) this file before sending to Support.