Databricks Runtime 7.3 LTS was a long-term support (LTS) release of Databricks that was built on Apache Spark 3.x. It offered improved ease of use, performance enhancements, and new features for Delta Lake. However, as of September 24, 2023, it has reached its end-of-life and is no longer supported.

Key points about Databricks Runtime 7.3 LTS:

• End of Support: Databricks 7.3 LTS is no longer supported, meaning it will not receive updates or security patches.
• Apache Spark 3.x: It was based on Apache Spark 3.x, which offered significant improvements in performance, ease of use, and new features.
• Delta Lake Enhancements: It included several enhancements for Delta Lake, Databricks’ open-source storage layer that brings reliability and performance to data lakes.
• Upgrade Recommended: Databricks strongly recommends upgrading to a newer, supported runtime version to ensure continued security and access to the latest features and improvements.