[chore] use mdatagen for exporterhelper metrics (open-telemetry#10094)

Uses the new mdatagen capabilities to generate internal telemetry
details for exporterhelper.

---------

Signed-off-by: Alex Boten <223565+codeboten@users.noreply.github.com>
(cherry picked from commit 5c72c5d)

cmd/mdatagen/main.go

@@ -62,22 +62,22 @@ func run(ymlPath string) error {
 				filepath.Join(codeDir, "generated_status.go"), md, "metadata"); err != nil {
 				return err
 			}
-			if err = generateFile(filepath.Join(tmplDir, "telemetry.go.tmpl"),
-				filepath.Join(codeDir, "generated_telemetry.go"), md, "metadata"); err != nil {
-				return err
-			}
-			if err = generateFile(filepath.Join(tmplDir, "telemetry_test.go.tmpl"),
-				filepath.Join(codeDir, "generated_telemetry_test.go"), md, "metadata"); err != nil {
-				return err
-			}
 			if err = generateFile(filepath.Join(tmplDir, "component_test.go.tmpl"),
 				filepath.Join(ymlDir, "generated_component_test.go"), md, packageName); err != nil {
 				return err
 			}
-			if err = generateFile(filepath.Join(tmplDir, "package_test.go.tmpl"),
-				filepath.Join(ymlDir, "generated_package_test.go"), md, packageName); err != nil {
-				return err
-			}
+		}
+		if err = generateFile(filepath.Join(tmplDir, "telemetry.go.tmpl"),
+			filepath.Join(codeDir, "generated_telemetry.go"), md, "metadata"); err != nil {
+			return err
+		}
+		if err = generateFile(filepath.Join(tmplDir, "telemetry_test.go.tmpl"),
+			filepath.Join(codeDir, "generated_telemetry_test.go"), md, "metadata"); err != nil {
+			return err
+		}
+		if err = generateFile(filepath.Join(tmplDir, "package_test.go.tmpl"),
+			filepath.Join(ymlDir, "generated_package_test.go"), md, packageName); err != nil {
+			return err
 		}
 
 		if _, err = os.Stat(filepath.Join(ymlDir, "README.md")); err == nil {

exporter/exporterhelper/doc.go

@@ -1,5 +1,7 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
+//go:generate mdatagen metadata.yaml
+
 // Package exporterhelper provides helper functions for exporters.
 package exporterhelper // import "go.opentelemetry.io/collector/exporter/exporterhelper"

exporter/exporterhelper/metadata.yaml

@@ -0,0 +1,81 @@
+type: exporterhelper
+
+status:
+  class: pkg
+  stability:
+    beta: [traces, metrics, logs]
+  distributions: [core, contrib]
+
+telemetry:
+  metrics:
+    exporter_sent_spans:
+      enabled: true
+      description: Number of spans successfully sent to destination.
+      unit: 1
+      sum:
+        value_type: int
+        monotonic: true
+
+    exporter_send_failed_spans:
+      enabled: true
+      description: Number of spans in failed attempts to send to destination.
+      unit: 1
+      sum:
+        value_type: int
+        monotonic: true
+
+    exporter_enqueue_failed_spans:
+      enabled: true
+      description: Number of spans failed to be added to the sending queue.
+      unit: 1
+      sum:
+        value_type: int
+        monotonic: true
+
+    exporter_sent_metric_points:
+      enabled: true
+      description: Number of metric points successfully sent to destination.
+      unit: 1
+      sum:
+        value_type: int
+        monotonic: true
+
+    exporter_send_failed_metric_points:
+      enabled: true
+      description: Number of metric points in failed attempts to send to destination.
+      unit: 1
+      sum:
+        value_type: int
+        monotonic: true
+
+    exporter_enqueue_failed_metric_points:
+      enabled: true
+      description: Number of metric points failed to be added to the sending queue.
+      unit: 1
+      sum:
+        value_type: int
+        monotonic: true
+
+    exporter_sent_log_records:
+      enabled: true
+      description: Number of log record successfully sent to destination.
+      unit: 1
+      sum:
+        value_type: int
+        monotonic: true
+
+    exporter_send_failed_log_records:
+      enabled: true
+      description: Number of log records in failed attempts to send to destination.
+      unit: 1
+      sum:
+        value_type: int
+        monotonic: true
+
+    exporter_enqueue_failed_log_records:
+      enabled: true
+      description: Number of log records failed to be added to the sending queue.
+      unit: 1
+      sum:
+        value_type: int
+        monotonic: true