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There´s a common request to any Qlik Sense Enterprise Administrator:
"Is there any way to be informed by e-mail when a reload task fails?" Yes, there is!
Before that, let´s have some technical small talk (you can jump to session "Creating your config xml" if you want)
Qlik Sense Enterprise relies on log4Net a very mature Apache Project that is very reliable and powerful. It, besides a lot of features , has the concept of Appender. That concept means that the application being logged (Qlik Sense in our case) does not to take care where the log is being stored, log4net config files handles this.
You can change a config file and choose if your log are meant to be stored into a database, a flat file, a hadoop data lake and you can even send an e-mail for each error message. 
Qlik Sense Enterprise help to Appenders
1 - Creating your config xml
Pick your favorite text editor and write your config file according this https://logging.apache.org/log4net/release/config-examples.html
No, wait!
I´m posting here a functional config file, you can copy and paste it. 
I´m supposing you´re going to use Gmail as the SMTP but is up to you chose any working SMTP that you want
<?xml version="1.0"?>
<configuration>
<!-- Mail appender-->
<appender name="MailAppender" type="log4net.Appender.SmtpAppender">
<filter type="log4net.Filter.LevelRangeFilter">
<param name="levelMin" value="WARN" />
<param name="levelMax" value="ERROR" />
</filter>
<filter type="log4net.Filter.DenyAllFilter" />
<evaluator type="log4net.Core.LevelEvaluator">
<param name="threshold" value="ERROR"/>
</evaluator>
<param name="to" value="admin@domain.com" /> <!-- please use your admin e-mail address here -->
<param name="cc" value="someone.else@domain.com" />
<param name="from" value="yourgmailaccount@gmail.com" /> <!-- you´re supposed to change this -->
<param name="subject" value="Qlik Sense Task Fail!!!" />
<param name="smtpHost" value="smtp.gmail.com" />
<param name="port" value="587" />
<param name="EnableSsl" value="true" />
<param name="Authentication" value="Basic" />
<param name="username" value="yourgmailaccount@gmail.com" /> <!-- you´re supposed to change this -->
<param name="password" value="yourpasswordforGmail" /> <!-- you´re supposed to change this -->
<param name="bufferSize" value="0" />
<!-- Set this to 0 to make sure an email is sent on every error -->
<param name="lossy" value="true" />
<layout type="log4net.Layout.PatternLayout">7
<!-- You can change below code if you want to pretify your e-mail message -->
<param name="conversionPattern" value="%newline%date %-5level %newline%property{TaskName}%newline%property{AppName}%newline%message%newline%newline%newline" />
</layout>
</appender>
<!--Send mail on task failure-->
<logger name="System.Scheduler.Scheduler.Slave.Tasks.ReloadTask"> <!-- Filter what kind of exceptionname is beeing captured -->
<appender-ref ref="MailAppender" />
</logger>
</configuration>
2 - Saving your config xml
You must save your file with LocalLogConfig.xml name and under C:\ProgramData\Qlik\Sense\Scheduler (at least until version April2018). Anything different from this will cause your configuration not work.
3 - Restarting your Scheduler Service
Check if any task is running before restarting the service!!
4 - Test
- Create an app and create an very "silly always fail" script like Store notable into [lib://neverland/notable.qvd](qvd)
- Schedule your app as usual (under QMC/Apps/[your app]/More options button/Create New Reload Task
Get a cup of coffee and wait for your task fail and your alert e-mail arrives at your inbox.
This blog post was written with fundamental contribution of ile that sent me a functional config file
