Dagster+ is a tool that helps ensure reliable data by monitoring and detecting issues in data pipelines. It enables teams to track the freshness of their data, identify quality issues, and catch changes in schema. With Dagster+, teams can monitor both source data and output data from their pipelines, allowing them to detect potential problems early on. The tool offers a full set of data reliability features, including asset checks that can be used as a basis for alerting and reporting. Additionally, Dagster+ provides an asset health dashboard that integrates pipeline failures, data quality, and freshness into a single view, making it easier to standardize data reliability across the entire data platform.