in the actual Version of ARM (2019.4) it is not possible to maintain a blacklist for file-types for Alarms for file-Server Monitoring.
This would allow you to filter out certain file-types (*.tmp, *.ini, *.log, etc... ) from the alarms, as some of them are not security-relevant.
Currently, there is only the possibility to exclude users or complete directories from the Alarms.
In FS Logga Configuration for Reports it is possible to filter out file-types.
Please check this idea.