Implicit and Explicit Validation
Data Collector performs two types of validation:
 - Implicit validation
 - Implicit validation occurs by default as Data Collector saves your changes. Implicit validation lists missing or incomplete configuration, such as an unconnected stage or a required property that has not been configured.
 - Explicit validation
 - Explicit validation occurs when you click the Validate icon, request data preview, or start the pipeline. Explicit validation becomes available when implicit validation passes.