Wikipages unaccessible - Sorry! This site is experiencing technical difficulties.

When I try to access https://wiki.librarything.com/ or my own subpages I get an error page:

Sorry! This site is experiencing technical difficulties.
Try waiting a few minutes and reloading.

(Cannot access the database: Too many connections (wiki.cwh621jgfadf.us-east-1.rds.amazonaws.com))

Backtrace:

#0 /var/www/html/includes/libs/rdbms/loadbalancer/LoadBalancer.php(995): Wikimedia\Rdbms\Database->reportConnectionError('Unknown error (...')
#1 /var/www/html/includes/libs/rdbms/loadbalancer/LoadBalancer.php(666): Wikimedia\Rdbms\LoadBalancer->reportConnectionError()
...

Seems to be accessible again. Closing.