Add tracking for many2many and one2many field in odoo16 is here:

from odoo import fields, Command

field_name = fields.Many2many('comodel_name', tracking=True)

Add the bellow function :

def _mail_track(self, tracked_fields, initial_values):
    changes, tracking_value_ids = super()._mail_track(tracked_fields, initial_values)
    # Many2many tracking
    if len(changes) > len(tracking_value_ids):
        for changed_field in changes:
            if tracked_fields[changed_field]['type'] in ['one2many', 'many2many']:
                field = self.env['ir.model.fields']._get(self._name, changed_field)
                vals = {
                    'field': field.id,
                    'field_desc': field.field_description,
                    'field_type': field.ttype,
                    'tracking_sequence': field.tracking,
                    'old_value_char': ', '.join(initial_values[changed_field].mapped('name')),
                    'new_value_char': ', '.join(self[changed_field].mapped('name')),
                }
                tracking_value_ids.append(Command.create(vals))
    return changes, tracking_value_ids

Thanks!

Try the following technical name module in the App Store.

"tracking_manager"

One2many_tracking in odoo apps store 

models.py:

# -*- coding: utf-8 -*-
from openerp import models, fields, api
# Chef Section  classchef(models.Model):    _name = 'restaurantsystemreve.chef'    _rec_name = 'firstname'        chefid = fields.Char(string='Chef ID', required=True)    firstname = fields.Char(string='First Name', required=True)    lastname = fields.Char(string='Last Name', required=True)    phoneno = fields.Char(string='Phone', required=True)    orderid = fields.Many2one('restaurantsystemreve.order', string="Oder ID", help="Oder ID", ondelete="restrict")