plugin example for https://forum.pyrocms.com/discussion/24488/disabling-streams-after-reaching-specific-count-of-entries#latest

plugin_example

<?php

class Plugin_registration {
  public function is_open()
  {
    $limit = $this->attribute('limit', 150);
    return ! ($limit >= $this->db->count_all('your_stream_table'));
  }
}