There are a few options when it comes to alerting inside of Qlik Sense. I tried to do an overview of those on this blog post. For this specific ask, there are two distinct options in my view:
- Push based
- Pull based
For push based alerting, you will likely want to use the QRS's Notification API. For an example of this to monitor Qlik Sense Services see this GitHub project: https://github.com/levi-turner/60f3cacb-c4ee-47d3-8a40-9f23530c0267. Now, in it, I am monitoring a single service (the Engine) and I am writing to a CSV rather than doing an email alert, but it's solved a handful of the logic so feel free to re-use it.
For the pull based, you can do similar QRS API calls on an interval and then fire off an email alert. Here's a pretty robust PowerShell library which makes connecting easy / easier: https://github.com/ahaydon/Qlik-Cli/. If you wanted to use raw PowerShell then I have examples on my GitHub for GET requests and POST requests. What I would imagine would be to do a GET on the /qrs/ServiceStatus path (which is the endpoint that is shown in the QMC > Nodes section). Then conditionally loop over the needed time period (not exactly the same thing but here's an example of a loop) then fire off an email at the end of the loop. Now I don't have a code example of that, but there should pretty good examples of these PowerShell specific work-flows on the general internet.
Hope that helps.
