Configure your report definition using the following parameters:
Number of days to query log* - Number of days back from the current date/time to include in the report.
Show entries matching the following description (use * for wildcards) - Enter a string to filter entries by their description. Include an asterisk (*) wildcard with the text you enter to match multiple records.
Ignore machines without data - Check this box to only display machine IDs that have data matching the other filter parameters.