public static function load()
    {
        if (!extension_loaded('opencensus')) {
            trigger_error('opencensus extension required to load Eloquent integrations.', E_USER_WARNING);
            return;
        }

        // public function getModels($columns = ['*'])
        opencensus_trace_method(Builder::class, 'getModels', function ($builder) {
            return [
                'name' => 'eloquent/get',
                'attributes' => [
                    'query' => $builder->toBase()->toSql()
                ],
                'kind' => Span::KIND_CLIENT
            ];
        });

        // protected function performInsert(Builder $query)
        opencensus_trace_method(Model::class, 'performInsert', function ($model, $query) {
            return [
                'name' => 'eloquent/insert',
                'attributes' => [
                    'query' => $query->toBase()->toSql()
                ],
                'kind' => Span::KIND_CLIENT
            ];
        });

        // protected function performUpdate(Builder $query)
        opencensus_trace_method(Model::class, 'performUpdate', function ($model, $query) {
            return [
                'name' => 'eloquent/update',
                'attributes' => [
                    'query' => $query->toBase()->toSql()
                ],
                'kind' => Span::KIND_CLIENT
            ];
        });

        // public function delete()
        opencensus_trace_method(Model::class, 'delete', function ($model) {
            return [
                'name' => 'eloquent/delete',
                'kind' => Span::KIND_CLIENT
            ];
        });
    }