[exporter/otlp] Allow DNS scheme to be used in endpoint (#10010)

Fixes #4274

Signed-off-by: Juraci Paixão Kröhling <juraci@kroehling.de>

.chloggen/4274-allow-dns-as-scheme-for-endpoint.yaml

@@ -0,0 +1,13 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: bug_fix
+
+# The name of the component, or a single word describing the area of concern, (e.g. otlpreceiver)
+component: exporter/otlp
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Allow DNS scheme to be used in endpoint
+
+# One or more tracking issues or pull requests related to the change
+issues: [4274]

exporter/otlpexporter/config.go

@@ -49,6 +49,8 @@ func (c *Config) sanitizedEndpoint() string {
 		return strings.TrimPrefix(c.Endpoint, "http://")
 	case strings.HasPrefix(c.Endpoint, "https://"):
 		return strings.TrimPrefix(c.Endpoint, "https://")
+	case strings.HasPrefix(c.Endpoint, "dns:///"):
+		return strings.TrimPrefix(c.Endpoint, "dns:///")
 	default:
 		return c.Endpoint
 	}

exporter/otlpexporter/config_test.go

@@ -130,3 +130,10 @@ func TestUnmarshalInvalidConfig(t *testing.T) {
 	}
 
 }
+
+func TestValidDNSEndpoint(t *testing.T) {
+	factory := NewFactory()
+	cfg := factory.CreateDefaultConfig().(*Config)
+	cfg.Endpoint = "dns:///backend.example.com:4317"
+	assert.NoError(t, cfg.Validate())
+}