We have defined a module with a simple module.xml and a registration.php file,

to call upon the regular flow of M2 merged XML layouts, to define a Block class that feeds data into a PHTML template,

which is then outputting a JSON configuration array that was inserted into the Block class using an XML argument-array,

and which is then used to initialize a custom AMD-style JS component through the Magento_Ui/js/core/app component,

which connects our require JS component to our KnockoutJS component.

Then, our JS component injects the customer-data component to collect a bit of information about the customer, which is fetched through a kind of local-storage-cached-AJAX-call to the backend,

which is configured through a DI type that injects an array of section sources into a backend class,

that fetches data from various sources, including our own, to then send back a bundled response, if possible, to the JS component, with the major feature being JavaScript AJAX lazy loading.

Namespace

/Module

/Block

Block.php

/etc

module.xml

/view

/frontend

/layouts

somelayout_file.xml

/templates

template.phtml

registration.php

Event/Observer

Event: backend_block_widget_grid_prepare_grid_before

Create Module

Namespace\Module\registration.php
Namespace\Module\composer.json
Namespace\Module\etc\module.xml
Namespace\Module\etc\adminhtml\events.xml
Namespace\Module\Model\Observer\BackendBlockWidgetGridPrepareGrid.php

events.xml

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
    <event name="backend_block_widget_grid_prepare_grid_before">
        <observer name="category_product_picker_grid"
                  instance="Namespace\Module\Model\Observer\BackendBlockWidgetGridPrepareGrid"
        />
    </event>
</config>

BackendBlockWidgetGridPrepareGrid.php

namespace Namespace\Module\Model\Observer;

use Magento\Framework\Event\ObserverInterface;

class BackendBlockWidgetGridPrepareGrid implements ObserverInterface
{
    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        $grid = $observer->getEvent()->getGrid();
        $grid->addColumn(
            'qty',
            [
                'header' => __('Quantity'),
                'type' => 'number',
                'index' => 'stock'
            ]
        );
        return $this;
    }
}

a:5:{i:0;s:52:"Front controller reached 100 router match iterations";i:1;s:499:"#0 /www/sites/*/app/code/core/Mage/Core/Controller/Varien/Front.php(183): Mage::throwException('Front controlle...')

#1 /www/sites/*/app/code/core/Mage/Core/Model/App.php(354): Mage_Core_Controller_Varien_Front->dispatch()

#2 /www/sites/*/app/Mage.php(683): Mage_Core_Model_App->run(Array)

#3 /www/sites/*/index.php(90): Mage::run('gloso_public', 'website')

#4 {main}";s:3:"url";s:17:"/admin";s:11:"script_name";s:16:"/index.php";s:4:"skin";s:17:"default";}

https://github.com/convenient/magento-ce-ee-config-corruption-bug#the-fix