stock-logistics-warehouse/stock_inventory_chatter/views/stock_inventory_view.xml

<?xml version="1.0" encoding="utf-8" ?>
<!-- Copyright 2017 ForgeFlow S.L.
     License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl). -->
<odoo>
    <record id="view_inventory_form" model="ir.ui.view">
        <field name="name">Inventory form view - add chatter </field>
        <field name="model">stock.inventory</field>
        <field name="inherit_id" ref="stock.view_inventory_form" />
        <field name="arch" type="xml">
            <sheet position="after">
                <div class="oe_chatter">
                    <field name="message_follower_ids" widget="mail_followers" />
                    <field name="message_ids" widget="mail_thread" />
                </div>
            </sheet>
        </field>
    </record>
</odoo>