Summary labels are key-values metadata attached to a summary sample. One summary sample can have many labels. Labels enable you to categorize your saved summaries, easily query, filter, and aggregate summaries with shared labels. For example, you can filter, aggregate, and visualize summaries based on user segments, release versions, batch pipeline job-id, data sources (e.g. training set, reference set etc.),and more. In a nutshell, labels provide the user with a lot of flexibility to perform rich filtering and aggregation.