As per Qatari labor law which ensure the minimum right of the employee the end of service will be one month of your lastest basic salary for each year of service plus full salary for vacations that you didnt take, air tickets in case you are leaving the country for good.
Notice periods must be min 45 days max 3 months.
If the company has a retirement policy with benefits above the labor law then thats the one you want to take as your benefits will be higher.