feat: add exporterhelper profiles telemetry metrics (#14423)

<!--Ex. Fixing a bug - Describe the bug and how this fixes the issue.
Ex. Adding a feature - Explain what this achieves.-->
#### Description

This adds obs metrics to the profiles exporters using `exporterhelper`
package.

This will be used by the profiles xexporterhelper initialization:
https://github.com/open-telemetry/opentelemetry-collector/blob/main/exporter/exporterhelper/xexporterhelper/profiles.go#L189

Follow-up PR of
#14226

Author: rogercoll

.chloggen/add_exporterhelper_profiles_telemetry.yaml

@@ -0,0 +1,25 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: enhancement
+
+# The name of the component, or a single word describing the area of concern, (e.g. receiver/otlp)
+component: pkg/exporterhelper
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Add support for profile samples metrics
+
+# One or more tracking issues or pull requests related to the change
+issues: [14423]
+
+# (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:
+
+# 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]

exporter/exporterhelper/documentation.md

@@ -22,6 +22,14 @@ Number of metric points failed to be added to the sending queue. [Alpha]
 | ---- | ----------- | ---------- | --------- | --------- |
 | {datapoints} | Sum | Int | true | Alpha |
 
+### otelcol_exporter_enqueue_failed_profile_samples
+
+Number of profile samples failed to be added to the sending queue. [Development]
+
+| Unit | Metric Type | Value Type | Monotonic | Stability |
+| ---- | ----------- | ---------- | --------- | --------- |
+| {samples} | Sum | Int | true | Development |
+
 ### otelcol_exporter_enqueue_failed_spans
 
 Number of spans failed to be added to the sending queue. [Alpha]
@@ -78,6 +86,14 @@ Number of metric points in failed attempts to send to destination. [Alpha]
 | ---- | ----------- | ---------- | --------- | --------- |
 | {datapoints} | Sum | Int | true | Alpha |
 
+### otelcol_exporter_send_failed_profile_samples
+
+Number of profile samples in failed attempts to send to destination. [Development]
+
+| Unit | Metric Type | Value Type | Monotonic | Stability |
+| ---- | ----------- | ---------- | --------- | --------- |
+| {samples} | Sum | Int | true | Development |
+
 ### otelcol_exporter_send_failed_spans
 
 Number of spans in failed attempts to send to destination. [Alpha]
@@ -102,6 +118,14 @@ Number of metric points successfully sent to destination. [Alpha]
 | ---- | ----------- | ---------- | --------- | --------- |
 | {datapoints} | Sum | Int | true | Alpha |
 
+### otelcol_exporter_sent_profile_samples
+
+Number of profile samples successfully sent to destination. [Development]
+
+| Unit | Metric Type | Value Type | Monotonic | Stability |
+| ---- | ----------- | ---------- | --------- | --------- |
+| {samples} | Sum | Int | true | Development |
+
 ### otelcol_exporter_sent_spans
 
 Number of spans successfully sent to destination. [Alpha]

exporter/exporterhelper/go.mod

@@ -26,6 +26,7 @@ require (
 	go.opentelemetry.io/collector/pdata/testdata v0.143.0
 	go.opentelemetry.io/collector/pdata/xpdata v0.143.0
 	go.opentelemetry.io/collector/pipeline v1.49.0
+	go.opentelemetry.io/collector/pipeline/xpipeline v0.143.0
 	go.opentelemetry.io/otel v1.39.0
 	go.opentelemetry.io/otel/metric v1.39.0
 	go.opentelemetry.io/otel/sdk v1.39.0
@@ -125,3 +126,5 @@ replace go.opentelemetry.io/collector/confmap/xconfmap => ../../confmap/xconfmap
 replace go.opentelemetry.io/collector/internal/testutil => ../../internal/testutil
 
 replace go.opentelemetry.io/collector/internal/componentalias => ../../internal/componentalias
+
+replace go.opentelemetry.io/collector/pipeline/xpipeline => ../../pipeline/xpipeline

exporter/exporterhelper/internal/metadata/generated_telemetry.go

@@ -18,6 +18,7 @@ import (
 	"go.opentelemetry.io/collector/exporter/exporterhelper/internal/request"
 	"go.opentelemetry.io/collector/exporter/exporterhelper/internal/sender"
 	"go.opentelemetry.io/collector/pipeline"
+	"go.opentelemetry.io/collector/pipeline/xpipeline"
 )
 
 const (
@@ -78,6 +79,9 @@ func newObsReportSender[K request.Request](set exporter.Settings, signal pipelin
 	case pipeline.SignalLogs:
 		or.itemsSentInst = telemetryBuilder.ExporterSentLogRecords
 		or.itemsFailedInst = telemetryBuilder.ExporterSendFailedLogRecords
+	case xpipeline.SignalProfiles:
+		or.itemsSentInst = telemetryBuilder.ExporterSentProfileSamples
+		or.itemsFailedInst = telemetryBuilder.ExporterSendFailedProfileSamples
 	}
 
 	return or, nil
@@ -105,14 +109,13 @@ func (ors *obsReportSender[K]) startOp(ctx context.Context) context.Context {
 }
 
 // EndOp completes the export operation that was started with StartOp.
-func (ors *obsReportSender[K]) endOp(ctx context.Context, numLogRecords int, err error) {
-	numSent, numFailedToSend := toNumItems(numLogRecords, err)
+func (ors *obsReportSender[K]) endOp(ctx context.Context, numRecords int, err error) {
+	numSent, numFailedToSend := toNumItems(numRecords, err)
 
-	// No metrics recorded for profiles.
 	if ors.itemsSentInst != nil {
 		ors.itemsSentInst.Add(ctx, numSent, ors.metricAttr)
 	}
-	// No metrics recorded for profiles.
+
 	if ors.itemsFailedInst != nil {
 		ors.itemsFailedInst.Add(ctx, numFailedToSend, ors.metricAttr)
 	}