Change default otlp exporter GRPC load balancer to round robin

.chloggen/load-balancer-round-robin.yaml

@@ -0,0 +1,19 @@
+# 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: grpcconfig
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Update default pick_first to round_robin load balancer
+
+# One or more tracking issues or pull requests related to the change
+issues: [10319]
+
+# 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.
+change_logs: [user]

config/configgrpc/configgrpc.go

@@ -55,6 +55,11 @@ func NewDefaultKeepaliveClientConfig() *KeepaliveClientConfig {
 	}
 }
 
+// NewDefaultBalancernameClientConfig returns a new instance of BalancernameClientConfig with default values.
+func NewDefaultBalancernameClientConfig() string {
+	return "round_robin"
+}
+
 // ClientConfig defines common settings for a gRPC client configuration.
 type ClientConfig struct {
 	// The target to which the exporter is going to send traces or metrics,
@@ -102,9 +107,10 @@ type ClientConfig struct {
 // NewDefaultClientConfig returns a new instance of ClientConfig with default values.
 func NewDefaultClientConfig() *ClientConfig {
 	return &ClientConfig{
-		TLSSetting: configtls.NewDefaultClientConfig(),
-		Keepalive:  NewDefaultKeepaliveClientConfig(),
-		Auth:       configauth.NewDefaultAuthentication(),
+		TLSSetting:   configtls.NewDefaultClientConfig(),
+		Keepalive:    NewDefaultKeepaliveClientConfig(),
+		Auth:         configauth.NewDefaultAuthentication(),
+		BalancerName: NewDefaultBalancernameClientConfig(),
 	}
 }
 

config/configgrpc/configgrpc_test.go

@@ -46,9 +46,10 @@ func TestNewDefaultKeepaliveClientConfig(t *testing.T) {
 
 func TestNewDefaultClientConfig(t *testing.T) {
 	expected := &ClientConfig{
-		TLSSetting: configtls.NewDefaultClientConfig(),
-		Keepalive:  NewDefaultKeepaliveClientConfig(),
-		Auth:       configauth.NewDefaultAuthentication(),
+		TLSSetting:   configtls.NewDefaultClientConfig(),
+		Keepalive:    NewDefaultKeepaliveClientConfig(),
+		Auth:         configauth.NewDefaultAuthentication(),
+		BalancerName: NewDefaultBalancernameClientConfig(),
 	}
 
 	result := NewDefaultClientConfig()
@@ -213,7 +214,7 @@ func TestAllGrpcClientSettings(t *testing.T) {
 				ReadBufferSize:  1024,
 				WriteBufferSize: 1024,
 				WaitForReady:    true,
-				BalancerName:    "configgrpc_balancer_test",
+				BalancerName:    "round_robin",
 				Authority:       "pseudo-authority",
 				Auth:            &configauth.Authentication{AuthenticatorID: testAuthID},
 			},