[exporter/kafka] do not expose method (open-telemetry#27583)

Do not export function WithTracesMarshalers, WithMetricsMarshalers,
WithLogsMarshalers and pass checkapi

open-telemetry#26304

**Testing:** 
go run cmd/checkapi/main.go .
make chlog-validate
go test for kafkaexporter


Co-authored-by: Alex Boten <aboten@lightstep.com>

.chloggen/kafkaexporter-checkapi-26304.yaml

@@ -0,0 +1,27 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: 'breaking'
+
+# The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver)
+component: kafkaexporter
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Do not export function WithTracesMarshalers, WithMetricsMarshalers, WithLogsMarshalers and pass checkapi
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [26304]
+
+# (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:
+
+# If your change doesn't affect end users or the exported elements of any package,
+# you should instead start your pull request title with [chore] or use the "Skip Changelog" label.
+# 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: [api]

cmd/checkapi/allowlist.txt

@@ -1,5 +1,4 @@
 connector/servicegraphconnector
-exporter/kafkaexporter
 extension/observer
 processor/servicegraphprocessor
 receiver/carbonreceiver

exporter/kafkaexporter/factory.go

@@ -41,26 +41,26 @@ const (
 // FactoryOption applies changes to kafkaExporterFactory.
 type FactoryOption func(factory *kafkaExporterFactory)
 
-// WithTracesMarshalers adds tracesMarshalers.
-func WithTracesMarshalers(tracesMarshalers ...TracesMarshaler) FactoryOption {
+// withTracesMarshalers adds tracesMarshalers.
+func withTracesMarshalers(tracesMarshalers ...TracesMarshaler) FactoryOption {
 	return func(factory *kafkaExporterFactory) {
 		for _, marshaler := range tracesMarshalers {
 			factory.tracesMarshalers[marshaler.Encoding()] = marshaler
 		}
 	}
 }
 
-// WithMetricsMarshalers adds additional metric marshalers to the exporter factory.
-func WithMetricsMarshalers(metricMarshalers ...MetricsMarshaler) FactoryOption {
+// withMetricsMarshalers adds additional metric marshalers to the exporter factory.
+func withMetricsMarshalers(metricMarshalers ...MetricsMarshaler) FactoryOption {
 	return func(factory *kafkaExporterFactory) {
 		for _, marshaler := range metricMarshalers {
 			factory.metricsMarshalers[marshaler.Encoding()] = marshaler
 		}
 	}
 }
 
-// WithLogMarshalers adds additional log marshalers to the exporter factory.
-func WithLogsMarshalers(logsMarshalers ...LogsMarshaler) FactoryOption {
+// withLogsMarshalers adds additional log marshalers to the exporter factory.
+func withLogsMarshalers(logsMarshalers ...LogsMarshaler) FactoryOption {
 	return func(factory *kafkaExporterFactory) {
 		for _, marshaler := range logsMarshalers {
 			factory.logsMarshalers[marshaler.Encoding()] = marshaler

exporter/kafkaexporter/factory_test.go

@@ -117,7 +117,7 @@ func TestCreateMetricExporter(t *testing.T) {
 		t.Run(tc.name, func(t *testing.T) {
 			t.Parallel()
 
-			f := NewFactory(WithMetricsMarshalers(tc.marshalers...))
+			f := NewFactory(withMetricsMarshalers(tc.marshalers...))
 			exporter, err := f.CreateMetricsExporter(
 				context.Background(),
 				exportertest.NewNopCreateSettings(),
@@ -191,7 +191,7 @@ func TestCreateLogExporter(t *testing.T) {
 		t.Run(tc.name, func(t *testing.T) {
 			t.Parallel()
 
-			f := NewFactory(WithLogsMarshalers(tc.marshalers...))
+			f := NewFactory(withLogsMarshalers(tc.marshalers...))
 			exporter, err := f.CreateLogsExporter(
 				context.Background(),
 				exportertest.NewNopCreateSettings(),
@@ -265,7 +265,7 @@ func TestCreateTraceExporter(t *testing.T) {
 		t.Run(tc.name, func(t *testing.T) {
 			t.Parallel()
 
-			f := NewFactory(WithTracesMarshalers(tc.marshalers...))
+			f := NewFactory(withTracesMarshalers(tc.marshalers...))
 			exporter, err := f.CreateTracesExporter(
 				context.Background(),
 				exportertest.NewNopCreateSettings(),