chore!(firewall): iptables logger level is set at FIREWALL_IPTABLES_LOG_LEVEL

- firewall log level is still fully controlled by `LOG_LEVEL`
- iptables log level defaults to `info` even if global log level is `debug` to minimize the amount of debug logs
- iptables log level is only set to debug if retro-compatible `FIREWALL_DEBUG=on` or if `FIREWALL_IPTABLES_LOG_LEVEL=debug`

internal/firewall/firewall.go

@@ -34,11 +34,11 @@ type Config struct {
 
 // NewConfig creates a new Config instance and returns an error
 // if no iptables implementation is available.
-func NewConfig(ctx context.Context, logger Logger,
+func NewConfig(ctx context.Context, logger, iptablesLogger Logger,
 	runner CmdRunner, defaultRoutes []routing.DefaultRoute,
 	localNetworks []routing.LocalNetwork,
 ) (config *Config, err error) {
-	impl, err := iptables.New(ctx, runner, logger)
+	impl, err := iptables.New(ctx, runner, iptablesLogger)
 	if err != nil {
 		return nil, fmt.Errorf("creating iptables firewall: %w", err)
 	}

internal/firewall/iptables/interfaces.go

@@ -8,7 +8,5 @@ type CmdRunner interface {
 
 type Logger interface {
 	Debug(s string)
-	Info(s string)
 	Warn(s string)
-	Error(s string)
 }

internal/firewall/iptables/mocks_test.go

@@ -84,30 +84,6 @@ func (mr *MockLoggerMockRecorder) Debug(arg0 interface{}) *gomock.Call {
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Debug", reflect.TypeOf((*MockLogger)(nil).Debug), arg0)
 }
 
-// Error mocks base method.
-func (m *MockLogger) Error(arg0 string) {
-	m.ctrl.T.Helper()
-	m.ctrl.Call(m, "Error", arg0)
-}
-
-// Error indicates an expected call of Error.
-func (mr *MockLoggerMockRecorder) Error(arg0 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Error", reflect.TypeOf((*MockLogger)(nil).Error), arg0)
-}
-
-// Info mocks base method.
-func (m *MockLogger) Info(arg0 string) {
-	m.ctrl.T.Helper()
-	m.ctrl.Call(m, "Info", arg0)
-}
-
-// Info indicates an expected call of Info.
-func (mr *MockLoggerMockRecorder) Info(arg0 interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Info", reflect.TypeOf((*MockLogger)(nil).Info), arg0)
-}
-
 // Warn mocks base method.
 func (m *MockLogger) Warn(arg0 string) {
 	m.ctrl.T.Helper()