Custom Logger for Laravel 5.6. Send messages to Telegram.

FooLogger.php

<?php

namespace App\Logging;

use DateTimeZone;
use Monolog\Logger;
use App\Logging\TelegramBotHandler;
use Monolog\Formatter\LineFormatter;

class FooLogger
{
    /**
     * Create a custom Monolog instance.
     *
     * @param  array  $config
     * @return \Monolog\Logger
     */
    public function __invoke(array $config)
    {
        Logger::setTimezone(new DateTimeZone('...'));

        $handler = new TelegramBotHandler(
            $config['token'], $config['chatId'], $config['level']
        );
        $handler->setFormatter(new LineFormatter(
            null, null, false, true
        ));

        return new Logger(config('app.name'), [$handler]);
    }
}

logging.php

<?php

use Monolog\Logger;

return [
    'channels' => [
        'stack' => [
            'driver' => 'stack',
            'channels' => ['telegram'],
        ],
        'telegram' => [
            'driver' => 'monolog',
            'handler' => App\Logging\TelegramBotHandler::class,
            'handler_with' => [
                'token' => '...',
                'chatId' => '...',
            ],
            'formatter' => Monolog\Formatter\LineFormatter::class,
            'formatter_with' => [
                'dateFormat' => 'Y-m-d H:i:s',
                'allowInlineLineBreaks' => false,
                'ignoreEmptyContextAndExtra' => true,
            ],
        ],
    ],
];

TelegramBotHandler.php

<?php

namespace App\Logging;

use Monolog\Logger;
use Illuminate\Support\Facades\Log;
use GuzzleHttp\Client as GuzzleClient;
use Monolog\Handler\AbstractProcessingHandler;

class TelegramBotHandler extends AbstractProcessingHandler
{
    protected $token;

    protected $chatId;

    public function __construct($token, $chatId, $level = Logger::ERROR)
    {
        $this->token = $token;
        $this->chatId = $chatId;
        parent::__construct($level);
    }

    public function write(array $record)
    {
        $this->sendMessage($record['formatted']);
    }

    protected function sendMessage($message)
    {
        $client = new GuzzleClient([
            'base_uri' => 'https://api.telegram.org/bot' . $this->token . '/',
        ]);

        $client->post('sendMessage', [
            'headers' => [
                'Accept' => 'application/json',
            ],
            'form_params' => [
                'chat_id' => $this->chatId,
                'text' => $message,
            ],
        ]);
    }
}