Bulk Operation

SPARK-23206 Fix code close issue in monitoring.md

SPARK-23206 Send ExecutorMetricsUpdate EventLog appropriately

SPARK-23206 Support task Metrics Distributions and executor Metrics Distributions in the REST API call for a specified stage

SPARK-23206 Add new executor metrics summary REST APIs and parameters

SPARK-23206 Expose executor memory metrics at the task detal, in the Stages tab

SPARK-23206 TaskEnd event with zero Executor Metrics when task duration less then poll interval

SPARK-23206 Add Executor level metrics to monitoring docs

SPARK-23206 Define query parameters to support various filtering conditions in REST API for overall stages

SPARK-23206 Expose executor memory metrics at the stage level, in the Stages tab

SPARK-23206 Add GC information to ExecutorMetrics

SPARK-23206 Add executors' process tree total memory information to heartbeat signals

SPARK-23206 Expose executor memory metrics in the web UI for executors

SPARK-23206 Expose the new executor memory metrics at the stage level

SPARK-23206 Add executor memory metrics to heartbeat and expose in executors REST API