Hope this debug toolbar can speed up Magento2 development module. Any feedback and idea to improve this toolbar will be appreciate so get in touch via the issue tracker on GitHub. Feel free to fork and pull request. Structure of this toolbar is extremly simple you just need to add a new block in the layout to get your tab running.

• Info : Information about controller, route, action and store. A dedicated tab output a phpinfo.
• Design : List handles called and display layout structure of nested blocks and containers
• Profile : View current observers, all events dispatched and collections, models loaded
• Queries : Statistics about executed queries and detailed query listing with syntax highlighting of main SQL keywords
• Logs : Display log files with ability to reset these files
• Actions : Easily toggle template hints and inline translation and flush cache

• Info tab

• Queries Tab

• Profile Tab

Copy files under app/code/ADM/QuickDevBar folder.

In the root directory

• Magento composer installer

composer require magento/magento-composer-installer

• Add the VCS repository: So that composer can find the module. Add the following lines in your composer.json

    "repositories": [
    {
        "type": "vcs",
        "url": "https://github.com/vpietri/magento2-developer-quickdevbar"
    }],
  

• Install the module

composer require vpietri/adm-quickdevbar

• Update Magento setup

php bin/magento setup:upgrade

• Update Magento data version

php bin/magento setup:db-data:upgrade

• Clear cache

php bin/magento cache:flush

0.1.5

• Back office toolbar
• Reorganize tabs
• Add list of collection and model instanciated
• Add Christian Bach's tablesorter plugin

0.1.4

• Fix bug on composer.json with registration.php
• Clean layout display

0.1.3

• Compatibility with Magento 2.0.0 Publication
• Add action tab (Template hints, Translate inline, Flush Cache Storage)
• Controller structure cleaning

0.1.2

• Add sub-tab and reorganize existing tabs

0.1.1

• Javascript cleaning to meet coding standards
• Add sunnywalker/filterTable
• Fix bugs on the log screen
• Css improvements

0.0.1

• module initialization