From fd8a3ba22ad77d092cd9541d5297b3cd9cabcc91 Mon Sep 17 00:00:00 2001
From: David Ashpole <dashpole@google.com>
Date: Tue, 3 Oct 2023 16:15:06 +0000
Subject: [PATCH] opencensus.NewMetricProducer returns a struct instead of the
 metric.Producer interface

---
 CHANGELOG.md                |  4 ++++
 bridge/opencensus/metric.go | 12 ++++++++----
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7e551679270..94870c638d6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,6 +16,10 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 
 - Deprecate `go.opentelemetry.io/otel/bridge/opencensus.NewTracer` in favor of `opencensus.InstallTraceBridge`. (#4567)
 
+### Changed
+
+- `go.opentelemetry.io/otel/bridge/opencensus.NewMetricProducer` returns a `*MetricProducer` struct instead of the metric.Producer interface. (#4583)
+
 ## [1.19.0/0.42.0/0.0.7] 2023-09-28
 
 This release contains the first stable release of the OpenTelemetry Go [metric SDK].
diff --git a/bridge/opencensus/metric.go b/bridge/opencensus/metric.go
index d11b1de21ba..67e7c2fabb3 100644
--- a/bridge/opencensus/metric.go
+++ b/bridge/opencensus/metric.go
@@ -26,19 +26,23 @@ import (
 	"go.opentelemetry.io/otel/sdk/metric/metricdata"
 )
 
-type producer struct {
+// MetricProducer implements the metric.Producer interface to provide metrics
+// from OpenCensus to the OpenTelemetry SDK.
+type MetricProducer struct {
 	manager *metricproducer.Manager
 }
 
 // NewMetricProducer returns a metric.Producer that fetches metrics from
 // OpenCensus.
-func NewMetricProducer(opts ...MetricOption) metric.Producer {
-	return &producer{
+func NewMetricProducer(opts ...MetricOption) *MetricProducer {
+	return &MetricProducer{
 		manager: metricproducer.GlobalManager(),
 	}
 }
 
-func (p *producer) Produce(context.Context) ([]metricdata.ScopeMetrics, error) {
+var _ metric.Producer = (*MetricProducer)(nil)
+
+func (p *MetricProducer) Produce(context.Context) ([]metricdata.ScopeMetrics, error) {
 	producers := p.manager.GetAll()
 	data := []*ocmetricdata.Metric{}
 	for _, ocProducer := range producers {