REG

Hi everyone, Probably already asked many times before. But here we go, I got my 187 visa granted November 2018 as a restaurant manager, and now the company is selling the restaurant to the new owner. The new owners are the operators and they don't want to keep me as a manager. It probably will be sold with in November with me being on my 12 month of the residency. My question is should I inform the immigration about what has happened or just let it got and find a new job? Another question is, will the immigration know about it? Has anyone been through the similar situation? Please advise. thanks