Alerts with no specifics (only variable names)

Running NPM 11.5 and occasionally receiving an email alert with no specific info other than

subject: There is less than 5% available free space on volume $(FullName)

body:

Volume ${FullName}:
Total size ${VolumeSize}
Free space ${VolumeSpaceAvailable}
Percent used ${VolumePercentUsed}

Link to the volume details page for more information: ${VolumeDetailsURL}