This Handler may be useful if you need send log messages to Mattermost channels, it's very easy to setup and integrate in your application if you are using Monolog.

composer require "viniciuswebdev/monolog-mattermost:1.0.0"

use Monolog\Logger;

$logger = new Logger('application');
$logger->pushHandler(new MattermostHandler('https://mattermost.my-company.net.br/hooks/xxx'));

$logger->info('Your message here!');

Just follow these few steps:

• Go to Integrations item on main menu
• Incoming Webhook
• Add Incoming Webhook
• Chose a name, description and the desired channel to publish
• Get the URL to use in the Handler constructor

The MIT License (MIT).