Instead of calling notification() (optionally passing it's default value of 'notifyproblem'), a few parts of the codebase just hardcode the output by creating a div with the class notifyproblem.

There's also several uses of notifyproblem on span tags, possibly they should also be redone with the API.

Usage of notifyproblem on table cells (primarily to get red text it seems) is also a problem, but probably a seperate one.

Examples are:

admin/blocks.php
126: $strblockname = '<span class="notifyproblem">'.$strblockname.' ('.get_string('missingfromdisk').')</span>';

admin/modules.php
93: $strmodulename = '<span class="notifyproblem">'.$module->name.' ('.get_string('missingfromdisk').')</span>';

admin/reports.php
94: $name = '<span class="notifyproblem">'.$name.' ('.get_string('missingfromdisk').')</span>';

admin/tools.php
94: $name = '<span class="notifyproblem">'.$name.' ('.get_string('missingfromdisk').')</span>';

auth/shibboleth/config.html
37: echo '<br/><span class="notifyproblem">';
75: echo '<br/><span class="notifyproblem">';

backup/util/ui/renderer.php
225: $html .= $this->output->heading(get_string('errorinvalidformat', 'backup'), 2, 'notifyproblem');
226: $html .= html_writer::tag('div', get_string('errorinvalidformatinfo', 'backup'), array('class' => 'notifyproblem'));
413: $output .= $this->output->notification($warning, 'notifywarning notifyproblem');
564: $cell->attributes['class'] = 'notifyproblem';
572: $cell->attributes['class'] = 'notifyproblem';
640: $cell->attributes['class'] = 'notifyproblem';
689: $cell->attributes['class'] = 'notifyproblem';
698: $cell->attributes['class'] = 'notifyproblem';

badges/backpack.js
8: var errorhtml = '<div id="addtobackpack-error" class="box boxaligncenter notifyproblem">' + errortext + '</div>';

badges/index.php
147:echo $OUTPUT->box('', 'notifyproblem hide', 'check_connection');
156: echo $OUTPUT->box(get_string('error:notifycoursedate', 'badges'), 'generalbox notifyproblem');

badges/newbadge.php
111:echo $OUTPUT->box('', 'notifyproblem hide', 'check_connection');

badges/renderer.php
346: $cell->attributes = array('class' => 'notifyproblem warning');
444: $cell->attributes = array('class' => 'notifyproblem warning');

badges/view.php
96: echo $OUTPUT->box(get_string('error:notifycoursedate', 'badges'), 'generalbox notifyproblem');

course/reset.php
81: $line[] = ($item['error']===false) ? get_string('ok') : '<div class="notifyproblem">'.$item['error'].'</div>';

group/autogroup.php
163: $line[] = '<span class="notifyproblem">'.get_string('groupnameexists', 'group', $group['name']).'</span>';

lib/adminlib.php
5150: $displayname = '<span class="notifyproblem">'.$name.'</span>';

lib/setuplib.php
1767: * @param string $classes usually notifyproblem or notifysuccess
1770: public static function early_notification($message, $classes = 'notifyproblem') {

lib/uploadlib.php
495: return '<p class="notifyproblem">'. $this->notify .'</p>';

user/filters/courserole.php
149: return '<span class="notifyproblem">'.get_string('courserolelabelerror', 'filters', $a).'</span>';