Expose this option as queue_batch.Settings

Author: sfc-gh-sili

.chloggen/exporter-batcher-merge-context.yaml

@@ -7,7 +7,7 @@ change_type: enhancement
 component: exporterhelper
 
 # A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
-note: Provide an interface `batchSettings.mergeCtx` so users can control how context values are preserved or combined
+note: Provide an interface `queue_batch.Setting.MergeCtx` so users can control how context values are preserved or combined
 
 # One or more tracking issues or pull requests related to the change
 issues: [13320]

exporter/exporterhelper/internal/queuebatch/queue_batch.go

@@ -23,6 +23,7 @@ type Settings[T any] struct {
 	ItemsSizer  request.Sizer[T]
 	BytesSizer  request.Sizer[T]
 	Partitioner Partitioner[T]
+	MergeCtx    func(context.Context, context.Context) context.Context
 }
 
 type QueueBatch struct {
@@ -39,6 +40,7 @@ func NewQueueBatch(
 		itemsSizer:  set.ItemsSizer,
 		bytesSizer:  set.BytesSizer,
 		partitioner: set.Partitioner,
+		mergeCtx:    set.MergeCtx,
 		next:        next,
 		maxWorkers:  cfg.NumConsumers,
 		logger:      set.Telemetry.Logger,