Fields searched by Alerts view Search function

Please document which properties of alerts are searched by the Search function of the alerts view.  We sometimes see results for search strings that we cannot explain why they are included in the search results.  For example, if I search for "WMI" I get alerts that do not contain "WMI" anywhere that I can see.  Perhaps the a list of the properties that contain the search string could be displayed in the UI as a tooltip to the search string input textbox.