[receiver/fluent_forward] rename to fluent_forward with deprecated alias fluentforward (#47930)

Part of #45339

Renames the `fluentforward` receiver type to `fluent_forward` to follow
the snake_case naming convention from
open-telemetry/opentelemetry-collector#14208.

The previous type `fluentforward` is preserved as a deprecated alias via
`xreceiver.WithDeprecatedTypeAlias`, so existing configs keep working
with a deprecation warning at startup.

Metric names and directory layout are unchanged.

---------

Co-authored-by: Israel Blancas <iblancasa@gmail.com>

Author: ogulcanaydogan

.chloggen/config.yaml

@@ -262,7 +262,7 @@ components:
     - receiver/file_log
     - receiver/file_stats
     - receiver/flinkmetrics
-    - receiver/fluentforward
+    - receiver/fluent_forward
     - receiver/github
     - receiver/gitlab
     - receiver/googlecloudmonitoring

.chloggen/rename-fluent-forward-receiver.yaml

@@ -0,0 +1,6 @@
+change_type: deprecation
+component: receiver/fluent_forward
+note: Rename receiver type from `fluentforward` to `fluent_forward`
+issues: [45339]
+subtext:
+change_logs: [user]

receiver/fluentforwardreceiver/README.md

@@ -18,6 +18,11 @@ This receiver runs a TCP server that accepts events via the
 [k8s]: https://github.com/open-telemetry/opentelemetry-collector-releases/tree/main/distributions/otelcol-k8s
 <!-- end autogenerated section -->
 
+> **Note:** The receiver type has been renamed from `fluentforward` to `fluent_forward` to follow the
+> snake_case naming convention. The old name `fluentforward` is preserved as a deprecated alias and
+> will continue to work, but a deprecation warning will be logged at startup. Please update your
+> configuration to use `fluent_forward:`.
+
 This receiver:
 
  - Does **not** support TLS or the handshake portion of the Forward protocol.
@@ -34,7 +39,7 @@ on port 8006:
 
 ```yaml
 receivers:
-  fluentforward:
+  fluent_forward:
     endpoint: 0.0.0.0:8006
 ```
 

receiver/fluentforwardreceiver/config_test.go

@@ -9,9 +9,10 @@ import (
 
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
-	"go.opentelemetry.io/collector/component"
 	"go.opentelemetry.io/collector/confmap/confmaptest"
 	"go.opentelemetry.io/collector/confmap/xconfmap"
+
+	"github.com/open-telemetry/opentelemetry-collector-contrib/receiver/fluentforwardreceiver/internal/metadata"
 )
 
 func TestLoadConfig(t *testing.T) {
@@ -21,7 +22,7 @@ func TestLoadConfig(t *testing.T) {
 	factory := NewFactory()
 	cfg := factory.CreateDefaultConfig()
 
-	sub, err := cm.Sub(component.MustNewID("fluentforward").String())
+	sub, err := cm.Sub(metadata.Type.String())
 	require.NoError(t, err)
 	require.NoError(t, sub.Unmarshal(cfg))
 

receiver/fluentforwardreceiver/documentation.md

@@ -1,6 +1,6 @@
 [comment]: <> (Code generated by mdatagen. DO NOT EDIT.)
 
-# fluentforward
+# fluent_forward
 
 ## Internal Telemetry
 

receiver/fluentforwardreceiver/factory.go

@@ -9,16 +9,18 @@ import (
 	"go.opentelemetry.io/collector/component"
 	"go.opentelemetry.io/collector/consumer"
 	"go.opentelemetry.io/collector/receiver"
+	"go.opentelemetry.io/collector/receiver/xreceiver"
 
 	"github.com/open-telemetry/opentelemetry-collector-contrib/receiver/fluentforwardreceiver/internal/metadata"
 )
 
 // NewFactory return a new receiver.Factory for fluentd forwarder.
 func NewFactory() receiver.Factory {
-	return receiver.NewFactory(
+	return xreceiver.NewFactory(
 		metadata.Type,
 		createDefaultConfig,
-		receiver.WithLogs(createLogsReceiver, metadata.LogsStability))
+		xreceiver.WithLogs(createLogsReceiver, metadata.LogsStability),
+		xreceiver.WithDeprecatedTypeAlias(metadata.DeprecatedType))
 }
 
 func createDefaultConfig() component.Config {

receiver/fluentforwardreceiver/generated_component_test.go

@@ -16,6 +16,7 @@ require (
 	go.opentelemetry.io/collector/receiver v1.56.1-0.20260424074859-d91c0edd1da5
 	go.opentelemetry.io/collector/receiver/receiverhelper v0.150.1-0.20260424074859-d91c0edd1da5
 	go.opentelemetry.io/collector/receiver/receivertest v0.150.1-0.20260424074859-d91c0edd1da5
+	go.opentelemetry.io/collector/receiver/xreceiver v0.150.1-0.20260424074859-d91c0edd1da5
 	go.opentelemetry.io/otel/metric v1.43.0
 	go.opentelemetry.io/otel/sdk/metric v1.43.0
 	go.opentelemetry.io/otel/trace v1.43.0
@@ -52,7 +53,6 @@ require (
 	go.opentelemetry.io/collector/pdata/xpdata v0.150.1-0.20260424074859-d91c0edd1da5 // indirect
 	go.opentelemetry.io/collector/pipeline v1.56.1-0.20260424074859-d91c0edd1da5 // indirect
 	go.opentelemetry.io/collector/pipeline/xpipeline v0.150.1-0.20260424074859-d91c0edd1da5 // indirect
-	go.opentelemetry.io/collector/receiver/xreceiver v0.150.1-0.20260424074859-d91c0edd1da5 // indirect
 	go.opentelemetry.io/otel v1.43.0 // indirect
 	go.opentelemetry.io/otel/sdk v1.43.0 // indirect
 	go.uber.org/multierr v1.11.0 // indirect