Remove configauth default, use nil in configgrpc default

.chloggen/configauth-remove-default.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: breaking
+
+# The name of the component, or a single word describing the area of concern, (e.g. otlpreceiver)
+component: configauth
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Remove NewDefaultAuthentication
+
+# One or more tracking issues or pull requests related to the change
+issues: [12223]
+
+# (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: |
+  The value returned by this function will always cause an error on startup.
+  In `configgrpc.Client/ServerConfig.Auth`, `nil` should be used instead to disable authentication.
+
+# 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: [api]

.chloggen/configgrpc-noauth-default.yaml

@@ -0,0 +1,26 @@
+# 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: configgrpc
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: "Set Auth to nil in NewDefaultClientConfig/NewDefaultServerConfig"
+
+# One or more tracking issues or pull requests related to the change
+issues: [12223]
+
+# (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: |
+  The value that was used previously would always cause an error on startup.
+
+# 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: [api]

config/configauth/configauth.go

@@ -27,11 +27,6 @@ type Authentication struct {
 	AuthenticatorID component.ID `mapstructure:"authenticator"`
 }
 
-// NewDefaultAuthentication returns a default authentication configuration.
-func NewDefaultAuthentication() *Authentication {
-	return &Authentication{}
-}
-
 // GetServerAuthenticator attempts to select the appropriate auth.Server from the list of extensions,
 // based on the requested extension name. If an authenticator is not found, an error is returned.
 func (a Authentication) GetServerAuthenticator(_ context.Context, extensions map[component.ID]component.Component) (auth.Server, error) {

config/configauth/configauth_test.go

@@ -17,12 +17,6 @@ import (
 
 var mockID = component.MustNewID("mock")
 
-func TestNewDefaultAuthentication(t *testing.T) {
-	auth := NewDefaultAuthentication()
-	assert.NotNil(t, auth)
-	assert.Empty(t, auth)
-}
-
 func TestGetServer(t *testing.T) {
 	testCases := []struct {
 		name          string

config/configgrpc/configgrpc.go

@@ -110,7 +110,6 @@ func NewDefaultClientConfig() *ClientConfig {
 	return &ClientConfig{
 		TLSSetting:   configtls.NewDefaultClientConfig(),
 		Keepalive:    NewDefaultKeepaliveClientConfig(),
-		Auth:         configauth.NewDefaultAuthentication(),
 		BalancerName: BalancerName(),
 	}
 }
@@ -196,7 +195,6 @@ type ServerConfig struct {
 func NewDefaultServerConfig() *ServerConfig {
 	return &ServerConfig{
 		Keepalive: NewDefaultKeepaliveServerConfig(),
-		Auth:      configauth.NewDefaultAuthentication(),
 	}
 }
 

config/configgrpc/configgrpc_test.go

@@ -47,7 +47,6 @@ func TestNewDefaultClientConfig(t *testing.T) {
 	expected := &ClientConfig{
 		TLSSetting:   configtls.NewDefaultClientConfig(),
 		Keepalive:    NewDefaultKeepaliveClientConfig(),
-		Auth:         configauth.NewDefaultAuthentication(),
 		BalancerName: BalancerName(),
 	}
 
@@ -83,7 +82,6 @@ func TestNewDefaultKeepaliveServerConfig(t *testing.T) {
 func TestNewDefaultServerConfig(t *testing.T) {
 	expected := &ServerConfig{
 		Keepalive: NewDefaultKeepaliveServerConfig(),
-		Auth:      configauth.NewDefaultAuthentication(),
 	}
 
 	result := NewDefaultServerConfig()