How can I check with if my site is running?

Question

Is there a way with Drush or something else to check if a specified Drupal site is still up and running, means fully normal functioning, after automated maintenance/updating in an external script?

Sometimes an update can fail in a script and then there is a none-functional site left. I want to detect that situation. So have a command and the output is the status of the site? E.g.

drush <command> <site>

yields down/up or something.

The drush status command doesnt seemed to have such functionality.

Edit

When I was searching for the tools suggested in the comments I see that i was unspecific in the beginning, sorry for that. I mean the script is updating Drupal core and modules via Composer and Drush e.g.

~/bin/composer.phar update drupal/core "drupal/core-*" --with-all-dependencies
drush updatedb -l $WEBSITENAME
drush cache:rebuild

So I don't speak about updating whole servers and systems, just automated updating Drush, core and modules.

Answer 1

The simplest definition of a running site is that it returns a status code 200. From the command line or a script, you could use wget or curl.

If you want to avoid these tools a Drush only solution would be using the built-in guzzle client:

drush ev "echo Drupal::httpClient()->head('www.example.com')->getStatusCode();"