Without the facade

The facade is the recommended default, not the only way in. It’s a thin layer over RoundlyConsulting\Metrics\MetricsManager, the facade root — inject it through the constructor for the same API with an explicit dependency and no static calls:

use App\Models\User;
use RoundlyConsulting\Metrics\MetricsManager;

final class DashboardController
{
    public function __construct(private MetricsManager $metrics) {}

    public function __invoke(): array
    {
        return [
            'revenue' => $this->metrics->get('revenue')->result()->value(),
            'signups' => $this->metrics->value()->count(User::query())->range('TODAY')->result()->value(),
        ];
    }
}

Metrics::fake() swaps the manager behind the facade and in the container, so an injected MetricsManager gets the fake too.

Metric classes on their own

A metric class works without the registry or the facade — make it, or resolve it through the container:

RegisteredUsers::make()->range('TODAY')->result();   // ValueResult
app(RegisteredUsers::class)->toArray();             // resolved through the container

No action classes

Metrics is a calculation package, so it has no action classes: the builders and your metric classes are the behaviour, and the manager only registers, resolves and invalidates them.