Here is an example of the advanced search we are using
project = "x" AND issuetype = Bug AND status = Open AND created >= -30d AND created <= 30d
I don't see a gadget that can really graph that per day.
You can use the 'Recently Created Chart' gadget and create a filter with the criteria you want other than the created range. Then set the Days Previously interval for 30.
https://confluence.atlassian.com/display/JIRA/Adding+the+Recently+Created+Chart+Gadget
More to the point, we would like to graph open bugs per day over a 30 day period.
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