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[SPARK-35369][DOC] Document ExecutorAllocationManager metrics #32500

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[SPARK-35369][DOC] Document ExecutorAllocationManager metrics #32500

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15 changes: 14 additions & 1 deletion docs/monitoring.md
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Expand Up @@ -1189,7 +1189,20 @@ This is the component with the largest amount of instrumented metrics
`spark.metrics.executorMetricsSource.enabled` (default is true)
- This source contains memory-related metrics. A full list of available metrics in this
namespace can be found in the corresponding entry for the Executor component instance.


- namespace=ExecutorAllocationManager
- **note:** these metrics are only emitted when using dynamic allocation. Conditional to a configuration
parameter `spark.dynamicAllocation.enabled` (default is false)
- executors.numberExecutorsToAdd
- executors.numberExecutorsPendingToRemove
- executors.numberAllExecutors
- executors.numberTargetExecutors
- executors.numberMaxNeededExecutors
- executors.numberExecutorsGracefullyDecommissioned.count
- executors.numberExecutorsDecommissionUnfinished.count
- executors.numberExecutorsExitedUnexpectedly.count
- executors.numberExecutorsKilledByDriver.count

- namespace=plugin.\<Plugin Class Name>
- Optional namespace(s). Metrics in this namespace are defined by user-supplied code, and
configured using the Spark plugin API. See "Advanced Instrumentation" below for how to load
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