Despite the fact that the Ambient display and other features have reduced the need for LED alerts on phones, some people are very upset about the removal of the S10 alert. If you are one of these people, you may be offered a new program called "Holey Light".
Chainfire, a well-known Android developer, has released this app yesterday in the Google Play Store. Much like the Energy Ring rotates the battery indicator around the camera for the S10 holes, Holey Light updates the edge of the S10 camera when the message is received. Chainfire says it should work on all S1
– Chainfire (@ChainfireXDA) April 3, 2019
The application is limited in functionality, partly because of the restrictions imposed by Android. The light will not appear on the lock screen because the software is locked from drawing on the lock screen. It will also not be displayed when the screen is off, outside the charging time of the phone.
Holey Light is free at the Play Store, and the source code is available on GitHub under the GPLv3 license.