Google just announced via email that they will remove their Trusted Contacts app from both Google Play and the Apple App Store today. However, it has added the same functionality to Google Maps with its location sharing feature, so you can still share or track contacts that way.
Trusted Contacts was originally launched over three years ago as a way for people to be aware of where they are trusted friends and family members. Even if the app is removed today, Google will continue to support it until December 1
You can also download all trusted contacts you have created from the Trusted Contacts page before the December 1 cut-off. At that point, the app no longer works for sharing or viewing places. To continue viewing and sharing location updates after December 1st, you can download the free Google Maps app on your iOS or Android device.