The logic below populates all the alerts to the test_alert_track lookup and display the alerts which are created within one day.
|rest splunk_server=local /servicesNS/-/search/saved/searches | search alert.track=1
| eval updated = strptime(updated,"%Y-%m-%dT%H:%M:%S")
| stats max(updated) as lastTime min(updated) as firsTime values(author) as author values(alert.track) as alert.track by title
| inputlookup append=t test_alert_track.csv
| stats min(firsTime) as firsTime max(lastTime) as lastTime values(author) as author values(alert.track) as alert.track by title
| outputlookup test_alert_track.csv
| search author!=nobody
| where now()-firsTime < 86400
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