FormattableMarkup : Add parameters, links to a text, table cell data.
Create a customizable text.
Example :use Drupal\Component\Render\FormattableMarkup;
$text = new FormattableMarkup('My name is @name', ['@name' => "The name"]);
Event dispatcher. Create event, Dispatch and Subscribe.
Drupal's event system allow to create triggers when an event has been happened like create a custom hook on drupal 7.
Event Subscriber to replace hook_boot and hook_init
Use Event Subscriber service.
The EventSubscriber allow to execute an action on boot as hook_boot or hook_init of drupal 7.
Example.
SSH force usage of a specific key
To force usage of a specific key, put in your ~/.ssh/config file :
Host [HOST_NAME]
Hostname [HOST_NAME]
User [USER_NAME]
Port [PORT]
IdentityFile ~/.ssh/[your_private_key]
Test website load using AB (ApacheBench)
The apache benchmark tool is very basic, and while it will give you a solid idea of some performance.
Some parameters: