[exporter][queuebatcher] set feature gate UsePullingBasedExporterQueu…

…eBatcher to beta (#12122)

<!--Ex. Fixing a bug - Describe the bug and how this fixes the issue.
Ex. Adding a feature - Explain what this achieves.-->
#### Description

This PR sets feature gate UsePullingBasedExporterQueueBatcher to beta.

<!-- Issue number if applicable -->
#### Link to tracking issue
#8122

<!--Describe what testing was performed and which tests were added.-->
#### Testing

<!--Describe the documentation added.-->
#### Documentation

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.chloggen/set-new-queue-batching-to-beta.yaml

@@ -0,0 +1,25 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: enhancement
+
+# The name of the component, or a single word describing the area of concern, (e.g. otlpreceiver)
+component: exporterhelper
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Set the feature gate UsePullingBasedExporterQueueBatcher to beta
+
+# One or more tracking issues or pull requests related to the change
+issues: [8122]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:
+
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: [user]

exporter/exporterhelper/internal/base_exporter.go

@@ -27,7 +27,7 @@ import (
 
 var usePullingBasedExporterQueueBatcher = featuregate.GlobalRegistry().MustRegister(
 	"exporter.UsePullingBasedExporterQueueBatcher",
-	featuregate.StageAlpha,
+	featuregate.StageBeta,
 	featuregate.WithRegisterFromVersion("v0.115.0"),
 	featuregate.WithRegisterDescription("if set to true, turns on the pulling-based exporter queue bathcer"),
 )

exporter/exporterhelper/internal/batch_sender_test.go

@@ -374,6 +374,14 @@ func TestBatchSender_ConcurrencyLimitReached(t *testing.T) {
 			expectedItems:    51,
 		},
 	}
+
+	// Why do we not expect the same behavior when usePullingBasedExporterQueueBatcher is true?
+	// This test checks that when concurrency limit of batch_sender is reached, the batch_sender will flush immediately.
+	// To avoid blocking, the concurrency limit is set to the number of concurrent goroutines that are in charge of
+	// reading from the queue and adding to batch. With the new model, we are pulling instead of pushing so we don't
+	// block the reading goroutine anymore.
+	defer setFeatureGateForTest(t, usePullingBasedExporterQueueBatcher, false)()
+
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
 			qCfg := exporterqueue.NewDefaultConfig()