otlptracehttp, otlpmetrichttp: Retry temporary HTTP request failures (#4679)

exporters/otlp/otlpmetric/otlpmetrichttp/client.go

@@ -18,6 +18,7 @@ import (
 	"bytes"
 	"compress/gzip"
 	"context"
+	"errors"
 	"fmt"
 	"io"
 	"net"
@@ -147,6 +148,10 @@ func (c *client) UploadMetrics(ctx context.Context, protoMetrics *metricpb.Resou
 
 		request.reset(iCtx)
 		resp, err := c.httpClient.Do(request.Request)
+		var urlErr *url.Error
+		if errors.As(err, &urlErr) && urlErr.Temporary() {
+			return newResponseError(http.Header{})
+		}
 		if err != nil {
 			return err
 		}

exporters/otlp/otlpmetric/otlpmetrichttp/client_test.go

@@ -65,6 +65,13 @@ func TestClient(t *testing.T) {
 	t.Run("Integration", otest.RunClientTests(factory))
 }
 
+func TestNewWithInvalidEndpoint(t *testing.T) {
+	ctx := context.Background()
+	exp, err := New(ctx, WithEndpoint("host:invalid-port"))
+	assert.Error(t, err)
+	assert.Nil(t, exp)
+}
+
 func TestConfig(t *testing.T) {
 	factoryFunc := func(ePt string, rCh <-chan otest.ExportResult, o ...Option) (metric.Exporter, *otest.HTTPCollector) {
 		coll, err := otest.NewHTTPCollector(ePt, rCh)
@@ -113,7 +120,7 @@ func TestConfig(t *testing.T) {
 		t.Cleanup(func() { close(rCh) })
 		t.Cleanup(func() { require.NoError(t, exp.Shutdown(ctx)) })
 		err := exp.Export(ctx, &metricdata.ResourceMetrics{})
-		assert.ErrorContains(t, err, context.DeadlineExceeded.Error())
+		assert.ErrorAs(t, err, new(retryableError))
 	})
 
 	t.Run("WithCompressionGZip", func(t *testing.T) {
@@ -174,17 +181,6 @@ func TestConfig(t *testing.T) {
 		assert.Len(t, coll.Collect().Dump(), 1)
 	})
 
-	t.Run("WithURLPath", func(t *testing.T) {
-		path := "/prefix/v2/metrics"
-		ePt := fmt.Sprintf("http://localhost:0%s", path)
-		exp, coll := factoryFunc(ePt, nil, WithURLPath(path))
-		ctx := context.Background()
-		t.Cleanup(func() { require.NoError(t, coll.Shutdown(ctx)) })
-		t.Cleanup(func() { require.NoError(t, exp.Shutdown(ctx)) })
-		assert.NoError(t, exp.Export(ctx, &metricdata.ResourceMetrics{}))
-		assert.Len(t, coll.Collect().Dump(), 1)
-	})
-
 	t.Run("WithTLSClientConfig", func(t *testing.T) {
 		ePt := "https://localhost:0"
 		tlsCfg := &tls.Config{InsecureSkipVerify: true}