Good point, Alex!
tuner did say:
[!!] Highest connection usage: 100% (152/151)
Users would see an error and have to wait before doing X for a connection to become available. Have users been seeing such an error?
Just in case:
mysql –u root –p SHOW STATUS LIKE 'max_used_connections';
Another in tuner report:
[!!] name resolution is active : a reverse name resolution is made for each new connection and can reduce performance
That applies even if config.php has 'localhost'. So skip_networking also advised.
Might also see what other max's ...
show status like 'max_%';
'SoS', Ken