liwo/app/Statists/SystemStatist.php

<?php

namespace App\Statists;

use Illuminate\Support\Arr;
use Illuminate\Support\Facades\Cache;

class SystemStatist implements Pipe
{
    public function handle($tasks, $next)
    {
        $key = 'systems.'. ($task->system_id ?? 0) . '.' . ($task->assignee_id ?? 0) .
            '.' . $task->workflow_id . '.' . $task->status_id;
        $node = Arr::get($result, $key, ['total' => 0, 'test' => 0, 'overdue' => 0]);
        $node['total'] = $node['total'] + 1;
        $node['test'] = $node['test'] + $task->ready_to_test;
        $node['overdue'] = $node['overdue'] + ($task->on_time? 0: 1);
        Arr::set($result, $key, $node);

        return $next($tasks);
    }
}