Firebase Timber tree

CrashReportingTree.kt

class CrashlyticsReportTree : Timber.Tree() {
    override fun log(priority: Int, tag: String?, message: String, t: Throwable?) {
        if (priority == Log.ERROR) { // only for error level
            with(Firebase.crashlytics) {
                // optional: setCustomKey("CUSTOME_TAG", any)
                recordException(it)
            }
        }
    }
}

// Configure in Application() when app starts
Timber.plant(CrashlyticsReportTree())