As per my knowledge this functionality is not available in Tab Online. You get this only in Tab Server 10.3.
That is correct. We're working hard to bring Data Alerts to Tableau Online. They aren't available yet though.
This feature is now available in Tableau Online.
Thanks for all your responses. This feature is now introduced in the tableau 10.4, I was able to test them using the Tableau online 10.4
I too tested yesterday
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As others have noted, Data-Driven Alerts are now available in Tableau Online! You can track the release of new features on the What's New in Tableau Online page.
For quick alert-creation steps, see Send Data-Driven Alerts from Tableau Online or Tableau Server .
updated thread to note that Mark's answer is now the best and most correct one.
Thank you Mark.