In the web app I work on, we have a toast component that we use to show the user status messages. It's usually used for showing error messages. I've been aware

In the web app I work on, we have a toast component that we use to show the user status messages. It's usually used for showing error messages. I've been aware of desktop notifications being around or a couple years now, but I haven't used em. What guidelines or general rule of thumb do you use when deciding if something is worth a notification?