record a metric with open census to ensure backwards compat

.chloggen/codeboten_use-otel-with-healthcheck-view.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: enhancement
+
+# The name of the component, or a single word describing the area of concern, (e.g. otlpreceiver)
+component: telemetry
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Add OpenCensus view to useOtelForInternalMetrics path
+
+# One or more tracking issues or pull requests related to the change
+issues: [9065]
+
+# (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: |
+  This ensures the healthcheck extension which relies on an OpenCensus
+  view continues to work as it does today when a user enables useOtelForInternalMetrics.
+
+# 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: []

exporter/exporterhelper/obsexporter.go

@@ -222,6 +222,15 @@ func (or *ObsReport) recordWithOtel(ctx context.Context, dataType component.Data
 
 	sentMeasure.Add(ctx, sent, metric.WithAttributes(or.otelAttrs...))
 	failedMeasure.Add(ctx, failed, metric.WithAttributes(or.otelAttrs...))
+	// This is here to ensure the current healthcheck extension continues
+	// to work even when using OpenTelemetry for collector metrics
+	if failed > 0 {
+		_ = stats.RecordWithTags(
+			ctx,
+			or.mutators,
+			obsmetrics.ExporterFailedToSendSpans.M(failed))
+	}
+
 }
 
 func (or *ObsReport) recordWithOC(ctx context.Context, dataType component.DataType, sent int64, failed int64) {

service/telemetry.go

@@ -33,6 +33,7 @@
 
 	"go.opentelemetry.io/collector/config/configtelemetry"
 	"go.opentelemetry.io/collector/internal/obsreportconfig"
+	"go.opentelemetry.io/collector/internal/obsreportconfig/obsmetrics"
 	"go.opentelemetry.io/collector/service/internal/proctelemetry"
 	"go.opentelemetry.io/collector/service/internal/servicetelemetry"
 	"go.opentelemetry.io/collector/service/telemetry"
@@ -169,6 +170,19 @@
 	if err != nil {
 		return err
 	}
+
+	// This is here to ensure the current healthcheck extension continues
+	// to work even when using OpenTelemetry for collector metrics
+	healthcheckView := &view.View{
+		Name:        obsmetrics.ExporterPrefix + "send_failed_requests",
+		Description: "number of times exporters failed to send requests to the destination",
+		Measure:     obsmetrics.ExporterFailedToSendSpans,
+		Aggregation: view.Count(),
+	}
+	if err := view.Register(healthcheckView); err != nil {
+		return err
+	}
+
 	tel.mp = mp
 	return nil
 }