The stage’s details page in Spark UI provides summary metrics for completed tasks, including:

• Duration of tasks.
• GC time: Total JVM garbage collection time.
• Shuffle spill (memory): Size of the deserialized form of the shuffled data in memory.
• Shuffle spill (disk): Size of the serialized form of the data on disk.

DBU Cost is not part of Spark UI metrics. DBU, or Databricks Unit, is a measure of processing capability per hour used for pricing purposes, depending on your cluster configuration.

References:

• Spark UI Documentation
• Databricks Pricing