What Are the Key Components of a Data Observability Tool?

Integrations is number one. If it doesn't integrate with the tools that you have, don't bother. No one knows your company's data better than you do as a data engineer. And if a tool that you are valuating or even considering building doesn't support the issues tha, have happened and you think will happen, probably not worth your time either. So i think it's very important for a tool to be as easy to implement and easy to maintain as possible.