Beyond traditional monitoring, observability is a crucial aspect of understanding the health of complex data-driven systems. It enables teams to identify issues such as duplicate or stale data, model drift, and biased training datasets that can lead to unintended consequences. Observability provides granular information about data quality, schema changes, lineage, freshness, distribution, volume, and other key pillars of data health, allowing teams to detect problems early and prevent them from becoming bigger issues. Unlike monitoring, observability enables active learning, root cause analysis, and collaboration across cross-functional teams to resolve data issues before they impact the business. By applying principles of software application observability and reliability to data and ML, teams can build more trustworthy and reliable systems, gain insight into model performance, detect drift, and identify the "why" behind broken data pipelines and failed models. Ultimately, observability is essential for building a culture of trust in data-driven systems and making informed decisions based on accurate insights.