WORKAROUND:
The command that is being processed in the back-end is the following:
free -mt | awk '$1 ~ /Mem:/ || $1 ~ /^total/ {print $1, $2, $3, $5, $6, $7}'
Attached below is a patched file (Unixconfig.xml) that fixes the problem. To install this do the following
1. Copy the file {DS install dir}\agent\conf\package\Unix\UNIXConfig.xml to another directory as a backup
2. Save the attached file into {DS install dir}\agent\conf\package\Unix
3. Restart the Spotlight Diagnostic Server Service.
STATUS:
Waiting for fix in the future release of Spotlight on SQL Server Enterprise