No changes in configs, just rolling upgrades applied

// Set up a default alerter (email to a single address)
// Alerting
$config['email']['default']      = "suddenly@suddenly.suddenly";    ## Default alert recipient
$config['email']['from']         = "Observium <observium@xxxx>";
$config['email']['default_only'] = FALSE;   ## Only use default recipient
$config['email']['enable']       = TRUE;    ## Enable email alerts

$config['email']['backend']      = 'smtp';

array(14

enable=>true

from=>Observium <observium@xxxx>

default=>suddenly@suddenly.suddenly

default_only=>false

graphs=>true

backend=>smtp

sendmail_path=>/usr/sbin/sendmail

smtp_host=>localhost

smtp_port=>25

smtp_timeout=>10

smtp_secure=>null

smtp_auth=>false

smtp_username=>null

smtp_password=>null)