Add skeleton for new rabbitmq exporter component (#31800)

**Description:**
Sets-up the configuration format and common component boilerplate for
the rabbitmq exporter

Implementation will be in other pull requests

**Link to tracking Issue:**
[28891](#28891)

**Testing:** Standard initial unit tests

**Documentation:** Created README for the component

---------

Co-authored-by: Antoine Toulme <antoine@toulme.name>

.chloggen/rabbitmq-exporter-skeleton.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: new_component
+
+# The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver)
+component: rabbitmqexporter
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Add new exporter for sending telemetry to RabbitMQ brokers using the AMQP 0.9.1 protocol
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [28891]
+
+# (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: [user]

.github/CODEOWNERS

@@ -72,6 +72,7 @@ exporter/otelarrowexporter/                              @open-telemetry/collect
 exporter/prometheusexporter/                             @open-telemetry/collector-contrib-approvers @Aneurysm9
 exporter/prometheusremotewriteexporter/                  @open-telemetry/collector-contrib-approvers @Aneurysm9 @rapphil
 exporter/pulsarexporter/                                 @open-telemetry/collector-contrib-approvers @dmitryax @dao-jun
+exporter/rabbitmqexporter/                               @open-telemetry/collector-contrib-approvers @swar8080
 exporter/sapmexporter/                                   @open-telemetry/collector-contrib-approvers @dmitryax @atoulme
 exporter/sentryexporter/                                 @open-telemetry/collector-contrib-approvers @AbhiPrasad
 exporter/signalfxexporter/                               @open-telemetry/collector-contrib-approvers @dmitryax @crobert-1

.github/ISSUE_TEMPLATE/bug_report.yaml

@@ -72,6 +72,7 @@ body:
       - exporter/prometheus
       - exporter/prometheusremotewrite
       - exporter/pulsar
+      - exporter/rabbitmq
       - exporter/sapm
       - exporter/sentry
       - exporter/signalfx

.github/ISSUE_TEMPLATE/feature_request.yaml

@@ -66,6 +66,7 @@ body:
       - exporter/prometheus
       - exporter/prometheusremotewrite
       - exporter/pulsar
+      - exporter/rabbitmq
       - exporter/sapm
       - exporter/sentry
       - exporter/signalfx

.github/ISSUE_TEMPLATE/other.yaml

@@ -66,6 +66,7 @@ body:
       - exporter/prometheus
       - exporter/prometheusremotewrite
       - exporter/pulsar
+      - exporter/rabbitmq
       - exporter/sapm
       - exporter/sentry
       - exporter/signalfx

exporter/rabbitmqexporter/Makefile

@@ -0,0 +1 @@
+include ../../Makefile.Common

exporter/rabbitmqexporter/README.md

@@ -0,0 +1,46 @@
+# RabbitMQ Exporter
+<!-- status autogenerated section -->
+| Status        |           |
+| ------------- |-----------|
+| Stability     | [development]: traces, metrics, logs   |
+| Distributions | [] |
+| Issues        | [![Open issues](https://img.shields.io/github/issues-search/open-telemetry/opentelemetry-collector-contrib?query=is%3Aissue%20is%3Aopen%20label%3Aexporter%2Frabbitmq%20&label=open&color=orange&logo=opentelemetry)](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues?q=is%3Aopen+is%3Aissue+label%3Aexporter%2Frabbitmq) [![Closed issues](https://img.shields.io/github/issues-search/open-telemetry/opentelemetry-collector-contrib?query=is%3Aissue%20is%3Aclosed%20label%3Aexporter%2Frabbitmq%20&label=closed&color=blue&logo=opentelemetry)](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues?q=is%3Aclosed+is%3Aissue+label%3Aexporter%2Frabbitmq) |
+| [Code Owners](https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/main/CONTRIBUTING.md#becoming-a-code-owner)    | [@swar8080](https://www.github.com/swar8080) |
+
+[development]: https://github.com/open-telemetry/opentelemetry-collector#development
+<!-- end autogenerated section -->
+
+Exports metrics, traces, and logs to [RabbitMQ](https://www.rabbitmq.com/) using the AMQP 0.9.1 protocol
+
+## Getting Started
+
+The following settings can be configured:
+- `connection`:
+    - `endpoint` (required, ex = amqp://localhost:5672): Endpoint to connect to RabbitMQ
+    - `vhost` (optional): The RabbitMQ [virtual host](https://www.rabbitmq.com/docs/vhosts) to connect to
+    - `auth`:
+      - `sasl`: Configuration if using SASL PLAIN authentication
+        - `username` (required): username for authentication
+        - `password` (required): password for authentication
+    - `tls` (optional): TODO, need to add this
+  - `routing`:
+    - `routing_key` (default = otlp_spans for traces, otlp_metrics for metrics, otlp_logs for logs): Routing key used to route exported messages to RabbitMQ consumers
+  - `durable` (default = true): Whether to instruct RabbitMQ to make messages [durable](https://www.rabbitmq.com/docs/queues#durability) by writing to disk
+  - `message_body_encoding`: (default = "otlp_proto"): The encoding of telemetry sent to RabbitMQ
+    - `otlp_proto`: payload is Protobuf serialized from `ExportTraceServiceRequest` if set as a traces exporter or `ExportMetricsServiceRequest` for metrics or `ExportLogsServiceRequest` for logs.
+    - `otlp_json`:  ** EXPERIMENTAL ** payload is JSON serialized from `ExportTraceServiceRequest` if set as a traces exporter or `ExportMetricsServiceRequest` for metrics or `ExportLogsServiceRequest` for logs.
+  - `retry_on_failure`:
+    - `enabled` (default = false)
+
+Example config:
+
+```yaml
+exporters:
+  rabbitmq:
+      connection:
+        endpoint: amqp://localhost:5672
+        auth:
+          sasl:
+            username: user
+            password: pass
+```

exporter/rabbitmqexporter/config.go

@@ -0,0 +1,43 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package rabbitmqexporter // import "github.com/open-telemetry/opentelemetry-collector-contrib/exporter/rabbitmqexporter"
+
+import (
+	"go.opentelemetry.io/collector/component"
+	"go.opentelemetry.io/collector/config/configretry"
+)
+
+type Config struct {
+	Connection          ConnectionConfig          `mapstructure:"connection"`
+	Routing             RoutingConfig             `mapstructure:"routing"`
+	MessageBodyEncoding string                    `mapstructure:"message_body_encoding"`
+	Durable             bool                      `mapstructure:"durable"`
+	RetrySettings       configretry.BackOffConfig `mapstructure:"retry_on_failure"`
+}
+
+type ConnectionConfig struct {
+	Endpoint string     `mapstructure:"endpoint"`
+	VHost    string     `mapstructure:"vhost"`
+	Auth     AuthConfig `mapstructure:"auth"`
+}
+
+type RoutingConfig struct {
+	RoutingKey string `mapstructure:"routing_key"`
+}
+
+type AuthConfig struct {
+	SASL SASLConfig `mapstructure:"sasl"`
+}
+
+type SASLConfig struct {
+	Username string `mapstructure:"username"`
+	Password string `mapstructure:"password"`
+}
+
+var _ component.Config = (*Config)(nil)
+
+// Validate checks if the exporter configuration is valid
+func (cfg *Config) Validate() error {
+	return nil
+}

exporter/rabbitmqexporter/config_test.go

@@ -0,0 +1,91 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package rabbitmqexporter
+
+import (
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"go.opentelemetry.io/collector/component"
+	"go.opentelemetry.io/collector/config/configretry"
+	"go.opentelemetry.io/collector/confmap/confmaptest"
+
+	"github.com/open-telemetry/opentelemetry-collector-contrib/exporter/rabbitmqexporter/internal/metadata"
+)
+
+func TestLoadConfig(t *testing.T) {
+	t.Parallel()
+
+	cm, err := confmaptest.LoadConf(filepath.Join("testdata", "test-config.yaml"))
+	require.NoError(t, err)
+
+	tests := []struct {
+		id       component.ID
+		expected component.Config
+	}{
+		{
+			id:       component.NewIDWithName(metadata.Type, ""),
+			expected: createDefaultConfig().(*Config),
+		},
+		{
+			id: component.NewIDWithName(metadata.Type, "all_fields"),
+			expected: &Config{
+				Connection: ConnectionConfig{
+					Endpoint: "amqp://localhost:5672",
+					VHost:    "vhost1",
+					Auth: AuthConfig{
+						SASL: SASLConfig{
+							Username: "user",
+							Password: "pass",
+						},
+					},
+				},
+				Routing: RoutingConfig{
+					RoutingKey: "custom_routing_key",
+				},
+				MessageBodyEncoding: "otlp_json",
+				Durable:             false,
+				RetrySettings: configretry.BackOffConfig{
+					Enabled: true,
+				},
+			},
+		},
+		{
+			id: component.NewIDWithName(metadata.Type, "mandatory_fields"),
+			expected: &Config{
+				Connection: ConnectionConfig{
+					Endpoint: "amqp://localhost:5672",
+					VHost:    "",
+					Auth: AuthConfig{
+						SASL: SASLConfig{
+							Username: "user",
+							Password: "pass",
+						},
+					},
+				},
+				MessageBodyEncoding: "otlp_proto",
+				Durable:             true,
+				RetrySettings: configretry.BackOffConfig{
+					Enabled: false,
+				},
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.id.String(), func(t *testing.T) {
+			factory := NewFactory()
+			cfg := factory.CreateDefaultConfig()
+
+			sub, err := cm.Sub(tt.id.String())
+			require.NoError(t, err)
+			require.NoError(t, component.UnmarshalConfig(sub, cfg))
+
+			assert.NoError(t, component.ValidateConfig(cfg))
+			assert.Equal(t, tt.expected, cfg)
+		})
+	}
+}

exporter/rabbitmqexporter/doc.go

@@ -0,0 +1,7 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+//go:generate mdatagen metadata.yaml
+
+// Package rabbitmqexporter exports telemetry to RabbitMQ using the AMQP 0.9.1 protocol
+package rabbitmqexporter // import "github.com/open-telemetry/opentelemetry-collector-contrib/exporter/rabbitmqexporter"

exporter/rabbitmqexporter/factory.go

@@ -0,0 +1,101 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package rabbitmqexporter // import "github.com/open-telemetry/opentelemetry-collector-contrib/exporter/rabbitmqexporter"
+
+import (
+	"context"
+
+	"go.opentelemetry.io/collector/component"
+	"go.opentelemetry.io/collector/config/configretry"
+	"go.opentelemetry.io/collector/consumer"
+	"go.opentelemetry.io/collector/exporter"
+	"go.opentelemetry.io/collector/exporter/exporterhelper"
+
+	"github.com/open-telemetry/opentelemetry-collector-contrib/exporter/rabbitmqexporter/internal/metadata"
+)
+
+const (
+	defaultEncoding = "otlp_proto"
+)
+
+func NewFactory() exporter.Factory {
+	return exporter.NewFactory(
+		metadata.Type,
+		createDefaultConfig,
+		exporter.WithLogs(createLogsExporter, metadata.LogsStability),
+		exporter.WithMetrics(createMetricsExporter, metadata.TracesStability),
+		exporter.WithTraces(createTracesExporter, metadata.LogsStability),
+	)
+}
+
+func createDefaultConfig() component.Config {
+	retrySettings := configretry.BackOffConfig{
+		Enabled: false,
+	}
+	return &Config{
+		MessageBodyEncoding: defaultEncoding,
+		Durable:             true,
+		RetrySettings:       retrySettings,
+	}
+}
+
+func createTracesExporter(
+	ctx context.Context,
+	set exporter.CreateSettings,
+	cfg component.Config,
+) (exporter.Traces, error) {
+	config := cfg.(*Config)
+	r := newRabbitmqExporter(config, set.TelemetrySettings)
+
+	return exporterhelper.NewTracesExporter(
+		ctx,
+		set,
+		cfg,
+		r.pushTraces,
+		exporterhelper.WithCapabilities(consumer.Capabilities{MutatesData: false}),
+		exporterhelper.WithStart(r.start),
+		exporterhelper.WithShutdown(r.shutdown),
+		exporterhelper.WithRetry(config.RetrySettings),
+	)
+}
+
+func createMetricsExporter(
+	ctx context.Context,
+	set exporter.CreateSettings,
+	cfg component.Config,
+) (exporter.Metrics, error) {
+	config := (cfg.(*Config))
+	r := newRabbitmqExporter(config, set.TelemetrySettings)
+
+	return exporterhelper.NewMetricsExporter(
+		ctx,
+		set,
+		cfg,
+		r.pushMetrics,
+		exporterhelper.WithCapabilities(consumer.Capabilities{MutatesData: false}),
+		exporterhelper.WithStart(r.start),
+		exporterhelper.WithShutdown(r.shutdown),
+		exporterhelper.WithRetry(config.RetrySettings),
+	)
+}
+
+func createLogsExporter(
+	ctx context.Context,
+	set exporter.CreateSettings,
+	cfg component.Config,
+) (exporter.Logs, error) {
+	config := (cfg.(*Config))
+	r := newRabbitmqExporter(config, set.TelemetrySettings)
+
+	return exporterhelper.NewLogsExporter(
+		ctx,
+		set,
+		cfg,
+		r.pushLogs,
+		exporterhelper.WithCapabilities(consumer.Capabilities{MutatesData: false}),
+		exporterhelper.WithStart(r.start),
+		exporterhelper.WithShutdown(r.shutdown),
+		exporterhelper.WithRetry(config.RetrySettings),
+	)
+}