Is there an option within Sense to send notification emails to customers/Stream owners for a Task running with success or failure?
No there is not.
According to Product Management, there is not currently a feature or roadmap item that is part of the reload scheduler in Sense for sending notifications regarding task reload results.
Are there third party solutions available?
Yes, see below.
There are several email notification solutions available for customers:Qlik Notification Connector (used for QlikView and QLik Sense)http://help.qlik.com/en-US/connectors/Subsystems/Web_Connectors_help/Content/Data-Source-Connectors/Notification-Connector.htm
(Note: The Notification Connector, may not be suitable for all use cases as it is more aimed for sending alerts during the reload process
and if you are wanting to catch an error you would have to implement error handling in all load scripts.)
Below are several solutions offered via *Branch.Qlik.com:
Qliksense Automated Task Failure Email Alerts
http://branch.qlik.com/#!/project/56fd8bd3353d08684f6726bcButler for Qlik Sense
*Branch products are developed independently from Qlik and not covered under the Qlik support umbrella. Any issues with these addons are reported directly to the developer as listed on their Qlik Branch page