feat(channels): add auto-disable-only channel test mode (#6728)

setting/operation_setting/monitor_setting.go

@@ -15,6 +15,7 @@ type MonitorSetting struct {
 
 const (
 	ChannelTestModeScheduledAll    = "scheduled_all"
+	ChannelTestModeAutoBanOnly     = "auto_ban_only"
 	ChannelTestModePassiveRecovery = "passive_recovery"
 )
 
@@ -45,7 +46,9 @@ func GetMonitorSetting() *MonitorSetting {
 			monitorSetting.AutoTestChannelEnabled = parsed
 		}
 	}
-	if monitorSetting.ChannelTestMode != ChannelTestModePassiveRecovery {
+	switch monitorSetting.ChannelTestMode {
+	case ChannelTestModeAutoBanOnly, ChannelTestModePassiveRecovery:
+	default:
 		monitorSetting.ChannelTestMode = ChannelTestModeScheduledAll
 	}
 	return &monitorSetting

setting/operation_setting/monitor_setting_test.go

@@ -41,3 +41,17 @@ func TestGetMonitorSetting_ChannelTestEnabledEnvCanEnableDisabledConfig(t *testi
 	assert.True(t, setting.AutoTestChannelEnabled)
 	assert.Equal(t, float64(12), setting.AutoTestChannelMinutes)
 }
+
+func TestGetMonitorSettingPreservesAutoBanOnlyMode(t *testing.T) {
+	orig := monitorSetting
+	t.Cleanup(func() { monitorSetting = orig })
+
+	t.Setenv("CHANNEL_TEST_ENABLED", "")
+	t.Setenv("CHANNEL_TEST_FREQUENCY", "")
+	monitorSetting = MonitorSetting{ChannelTestMode: ChannelTestModeAutoBanOnly}
+
+	setting := GetMonitorSetting()
+
+	require.NotNil(t, setting)
+	assert.Equal(t, ChannelTestModeAutoBanOnly, setting.ChannelTestMode)
+}