tethys/app/Providers/AppServiceProvider.php

<?php
namespace App\Providers;

use App\Models\Dataset;
use App\Observers\DatasetObserver;
use Illuminate\Support\ServiceProvider;

class AppServiceProvider extends ServiceProvider
{
    /**
     * Bootstrap any application services.
     *
     * @return void
     */
    public function boot()
    {
        Dataset::observe(DatasetObserver::class);
    }

    /**
     * Register any application services.
     *
     * This service provider is a great spot to register your various container
     * bindings with the application. As you can see, we are registering our
     * "Registrar" implementation here. You can add your own bindings too!
     *
     * @return void
     */
    public function register()
    {
        // $this->app->bind(
        //     'Illuminate\Contracts\Auth\Registrar'
        //     // 'App\Services\Registrar'
        // );
    }
}