Introducing Gap Filling for Time Series Data in MongoDB 5.3 allows developers to handle missing data in time series and regular collections by creating new documents with densified data and filling in null values using linear interpolation or carrying over the last observation. This feature, available in MongoDB 5.3 Rapid Release, streamlines analytics for any use case, enabling valuable insights from continuous time series data. Gap filling combines with densification introduced in MongoDB 5.1 to simplify handling missing data across different collections. With this functionality, developers can build rich analytics on time series data in-flight and deliver operational insight as part of the application experience, overcoming previous trade-offs between specialized systems or complex data pipelines.