You run the search every 42 past the full hour but your search is looking back 24 hours, am i right? So i when the scheduler is running the search at 0:42 you will find all events from the past 24 hours, if the search will run the next time at 1:42 it will also send you all the events from the past 24 hours, also the events which have been sent in the previous run at 0:42 with the exeption that the events between 0:42 and 1:42 are not included.. - you know that i mean? but you have overlaping timeranges, so events will be send multiple times. Change the time range to -1h or the cron only to run the search only once daily: for example 00 1 * * *
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