Saved searches, saved reports, and report schedules use the Analytics Audit Trail for auditing changes. The analytics audit trail offers the following features:
Audit Trail Subtab - directly from the relevant Saved Search, Saved Report, or Report Schedule edit page, you can view the history of changes made to that search or report. See Audit Trail Subtab.
Audit Trail Search - You can create custom saved searches to display audit trail data covering all Saved Searches, Saved Reports and Report Schedules. See Audit Trail Search.
Execution of Saved searches is audited by the execution log. To view data on when the search was last run and by whom, see Auditing Saved Search Execution.
Execution log is available for saved searches only.