add batchSize support for webhook endpoints (#19214)

configure batch size to send audit/logger events
in batches instead of sending one event per connection.

this is mainly to optimize the number of requests
we make to webhook endpoint.

internal/logger/help.go

@@ -52,6 +52,12 @@ var (
 			Type:        "string",
 			Sensitive:   true,
 		},
+		config.HelpKV{
+			Key:         BatchSize,
+			Description: "Number of events per HTTP send to webhook target",
+			Optional:    true,
+			Type:        "number",
+		},
 		config.HelpKV{
 			Key:         QueueSize,
 			Description: "configure channel queue size for webhook targets",
@@ -107,6 +113,12 @@ var (
 			Type:        "string",
 			Sensitive:   true,
 		},
+		config.HelpKV{
+			Key:         BatchSize,
+			Description: "Number of events per HTTP send to webhook target",
+			Optional:    true,
+			Type:        "number",
+		},
 		config.HelpKV{
 			Key:         QueueSize,
 			Description: "configure channel queue size for webhook targets",