mail_tracking_mass_mailing/views/mail_mail_statistics_view.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- © 2016 Antonio Espinosa - <antonio.espinosa@tecnativa.com>
     License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html). -->
<openerp>
<data>

<record model="ir.ui.view" id="view_mail_mail_statistics_form">
    <field name="name">Agregar Información de Seguimiento</field>
    <field name="model">mail.mail.statistics</field>
    <field name="inherit_id" ref="mass_mailing.view_mail_mail_statistics_form"/>
    <field name="arch" type="xml">
        <xpath expr="//form" position="inside">
            <group>
                <field name="mail_tracking_id" />
            </group>
            <label for="tracking_event_ids"/>
            <div>
                <field name="tracking_event_ids">
                    <tree string="Tracking events" colors="grey:event_type in ('deferral');black:event_type in ('send');red:event_type in ('hard_bounce', 'soft_bounce', 'spam', 'reject');blue:event_type in ('unsub', 'click', 'open')">
                        <field name="time"/>
                        <field name="event_type"/>
                        <field name="ip"/>
                        <field name="url"/>
                        <field name="user_country_id" string="Country"/>
                        <field name="os_family" string="OS"/>
                        <field name="ua_family" string="User agent"/>
                    </tree>
                </field>
            </div>
        </xpath>
    </field>
</record>

</data>
</openerp>