Most Applets give you the option to send a mobile notification from the IFTTT app whenever they run. Many users find this handy with troubleshooting or knowing when to check on something that IFTTT is connected to.
To locate this setting, find the ⚙︎ icon on the top right of an Applet and you should see a similar screen to the one below.
Note that this option will not appear if your Applet includes a notification action (Notifications, SMS, Email, etc.)