diff --git a/client/client.go b/client/client.go
index e3d3f4e5b14..fa0a1473ba7 100644
--- a/client/client.go
+++ b/client/client.go
@@ -438,7 +438,7 @@ func (c *client) UpdateOption(option opt.DynamicOption, value any) error {
 		}
 	case opt.EnableTSOFollowerProxy:
 		if c.inner.getServiceMode() != pdpb.ServiceMode_PD_SVC_MODE {
-			return errors.New("[pd] tso follower proxy is only supported in PD mode")
+			return errors.New("[pd] tso follower proxy is only supported when PD provides TSO")
 		}
 		enable, ok := value.(bool)
 		if !ok {
@@ -526,7 +526,7 @@ func (c *client) GetLocalTS(ctx context.Context, _ string) (physical int64, logi
 
 // GetMinTS implements the TSOClient interface.
 func (c *client) GetMinTS(ctx context.Context) (physical int64, logical int64, err error) {
-	// Handle compatibility issue in case of PD/PD service doesn't support GetMinTS API.
+	// Handle compatibility issue in case of PD doesn't support GetMinTS API.
 	serviceMode := c.inner.getServiceMode()
 	switch serviceMode {
 	case pdpb.ServiceMode_UNKNOWN_SVC_MODE:
diff --git a/client/http/client.go b/client/http/client.go
index b7109166a30..7f49f706d8f 100644
--- a/client/http/client.go
+++ b/client/http/client.go
@@ -245,7 +245,7 @@ func (ci *clientInner) doRequest(
 		if readErr != nil {
 			logFields = append(logFields, zap.NamedError("read-body-error", err))
 		} else {
-			// PD service will return a JSON body containing the detailed error message
+			// PD will return a JSON body containing the detailed error message
 			// when the status code is not `http.StatusOK` 200.
 			bs = bytes.TrimSpace(bs)
 			logFields = append(logFields, zap.ByteString("body", bs))
diff --git a/client/inner_client.go b/client/inner_client.go
index 8379b6a51a9..918941f630a 100644
--- a/client/inner_client.go
+++ b/client/inner_client.go
@@ -67,19 +67,31 @@ func (c *innerClient) setServiceMode(newMode pdpb.ServiceMode) {
 		// If we are using TSO server proxy, we always use PD_SVC_MODE.
 		newMode = pdpb.ServiceMode_PD_SVC_MODE
 	}
-
 	if newMode == c.serviceMode {
 		return
 	}
-	log.Info("[pd] changing service mode",
-		zap.String("old-mode", c.serviceMode.String()),
-		zap.String("new-mode", newMode.String()))
+	log.Info("[pd] changing TSO provider",
+		zap.String("old", convertToString(c.serviceMode)),
+		zap.String("new", convertToString(newMode)))
 	c.resetTSOClientLocked(newMode)
 	oldMode := c.serviceMode
 	c.serviceMode = newMode
-	log.Info("[pd] service mode changed",
-		zap.String("old-mode", oldMode.String()),
-		zap.String("new-mode", newMode.String()))
+	log.Info("[pd] TSO provider changed",
+		zap.String("old", convertToString(oldMode)),
+		zap.String("new", convertToString(newMode)))
+}
+
+func convertToString(mode pdpb.ServiceMode) string {
+	switch mode {
+	case pdpb.ServiceMode_PD_SVC_MODE:
+		return "pd"
+	case pdpb.ServiceMode_API_SVC_MODE:
+		return "tso server"
+	case pdpb.ServiceMode_UNKNOWN_SVC_MODE:
+		return "unknown"
+	default:
+		return "invalid"
+	}
 }
 
 // Reset a new TSO client.
@@ -102,9 +114,8 @@ func (c *innerClient) resetTSOClientLocked(mode pdpb.ServiceMode) {
 		newTSOCli = tso.NewClient(c.ctx, c.option,
 			newTSOSvcDiscovery, &tso.MSStreamBuilderFactory{})
 		if err := newTSOSvcDiscovery.Init(); err != nil {
-			log.Error("[pd] failed to initialize tso service discovery. keep the current service mode",
+			log.Error("[pd] failed to initialize tso service discovery",
 				zap.Strings("svr-urls", c.svrUrls),
-				zap.String("current-mode", c.serviceMode.String()),
 				zap.Error(err))
 			return
 		}
@@ -119,12 +130,12 @@ func (c *innerClient) resetTSOClientLocked(mode pdpb.ServiceMode) {
 	oldTSOClient.Close()
 	// Replace the old TSO service discovery if needed.
 	oldTSOSvcDiscovery := c.tsoSvcDiscovery
-	// If newTSOSvcDiscovery is nil, that's expected, as it means we are switching to PD mode and
+	// If newTSOSvcDiscovery is nil, that's expected, as it means we are switching to non-microservice env and
 	// no tso microservice discovery is needed.
 	c.tsoSvcDiscovery = newTSOSvcDiscovery
 	// Close the old TSO service discovery safely after both the old client and service discovery are replaced.
 	if oldTSOSvcDiscovery != nil {
-		// We are switching from PD service mode to PD mode, so delete the old tso microservice discovery.
+		// We are switching from microservice env to non-microservice env, so delete the old tso microservice discovery.
 		oldTSOSvcDiscovery.Close()
 	}
 }
diff --git a/client/servicediscovery/service_discovery.go b/client/servicediscovery/service_discovery.go
index f5ac665b7cd..e2b676b500f 100644
--- a/client/servicediscovery/service_discovery.go
+++ b/client/servicediscovery/service_discovery.go
@@ -407,7 +407,7 @@ var (
 	_ TSOEventSource   = (*serviceDiscovery)(nil)
 )
 
-// serviceDiscovery is the service discovery client of PD/PD service which is quorum based
+// serviceDiscovery is the service discovery client of PD which is quorum based
 type serviceDiscovery struct {
 	isInitialized bool
 
@@ -502,7 +502,7 @@ func (c *serviceDiscovery) Init() error {
 	log.Info("[pd] init cluster id", zap.Uint64("cluster-id", c.clusterID))
 
 	// We need to update the keyspace ID before we discover and update the service mode
-	// so that TSO in API mode can be initialized with the correct keyspace ID.
+	// so that TSO in PD can be initialized with the correct keyspace ID.
 	if c.keyspaceID == constants.NullKeyspaceID && c.updateKeyspaceIDFunc != nil {
 		if err := c.initRetry(c.updateKeyspaceIDFunc); err != nil {
 			return err
@@ -864,7 +864,7 @@ func (c *serviceDiscovery) checkServiceModeChanged() error {
 	clusterInfo, err := c.getClusterInfo(c.ctx, leaderURL, c.option.Timeout)
 	if err != nil {
 		if strings.Contains(err.Error(), "Unimplemented") {
-			// If the method is not supported, we set it to pd mode.
+			// If the method is not supported, we fallback to non-microservice env.
 			// TODO: it's a hack way to solve the compatibility issue.
 			// we need to remove this after all maintained version supports the method.
 			if c.serviceModeUpdateCb != nil {
diff --git a/pkg/keyspace/tso_keyspace_group.go b/pkg/keyspace/tso_keyspace_group.go
index a6068ffc2bb..86e0c9e9cf1 100644
--- a/pkg/keyspace/tso_keyspace_group.go
+++ b/pkg/keyspace/tso_keyspace_group.go
@@ -374,7 +374,6 @@ func (m *GroupManager) saveKeyspaceGroups(keyspaceGroups []*endpoint.KeyspaceGro
 
 // GetKeyspaceConfigByKind returns the keyspace config for the given user kind.
 func (m *GroupManager) GetKeyspaceConfigByKind(userKind endpoint.UserKind) (map[string]string, error) {
-	// when server is not in API mode, we don't need to return the keyspace config
 	if m == nil {
 		return map[string]string{}, nil
 	}
@@ -418,7 +417,6 @@ var failpointOnce sync.Once
 
 // UpdateKeyspaceForGroup updates the keyspace field for the keyspace group.
 func (m *GroupManager) UpdateKeyspaceForGroup(userKind endpoint.UserKind, groupID string, keyspaceID uint32, mutation int) error {
-	// when server is not in API mode, we don't need to update the keyspace for keyspace group
 	if m == nil {
 		return nil
 	}
@@ -477,7 +475,6 @@ func (m *GroupManager) updateKeyspaceForGroupLocked(userKind endpoint.UserKind,
 
 // UpdateKeyspaceGroup updates the keyspace group.
 func (m *GroupManager) UpdateKeyspaceGroup(oldGroupID, newGroupID string, oldUserKind, newUserKind endpoint.UserKind, keyspaceID uint32) error {
-	// when server is not in API mode, we don't need to update the keyspace group
 	if m == nil {
 		return nil
 	}
diff --git a/pkg/tso/global_allocator.go b/pkg/tso/global_allocator.go
index 553e0b0effd..ea91bcdfadc 100644
--- a/pkg/tso/global_allocator.go
+++ b/pkg/tso/global_allocator.go
@@ -171,7 +171,7 @@ func (gta *GlobalTSOAllocator) Reset() {
 }
 
 // primaryElectionLoop is used to maintain the TSO primary election and TSO's
-// running allocator. It is only used in API mode.
+// running allocator. It is only used in microservice env.
 func (gta *GlobalTSOAllocator) primaryElectionLoop() {
 	defer logutil.LogPanic()
 	defer gta.wg.Done()
diff --git a/pkg/utils/keypath/key_path.go b/pkg/utils/keypath/key_path.go
index 1a56ad3330a..13dfe16d907 100644
--- a/pkg/utils/keypath/key_path.go
+++ b/pkg/utils/keypath/key_path.go
@@ -321,7 +321,7 @@ func svcRootPath(svcName string) string {
 	return path.Join(constant.MicroserviceRootPath, c, svcName)
 }
 
-// LegacyRootPath returns the root path of legacy pd service.
+// LegacyRootPath returns the root path of legacy PD.
 // Path: /pd/{cluster_id}
 func LegacyRootPath() string {
 	return path.Join(pdRootPath, strconv.FormatUint(ClusterID(), 10))
diff --git a/server/apiv2/handlers/micro_service.go b/server/apiv2/handlers/microservice.go
similarity index 100%
rename from server/apiv2/handlers/micro_service.go
rename to server/apiv2/handlers/microservice.go
diff --git a/server/cluster/cluster.go b/server/cluster/cluster.go
index 8923efef9a6..13cc13d9e02 100644
--- a/server/cluster/cluster.go
+++ b/server/cluster/cluster.go
@@ -1179,7 +1179,7 @@ func (c *RaftCluster) processRegionHeartbeat(ctx *core.MetaProcessContext, regio
 		// Due to some config changes need to update the region stats as well,
 		// so we do some extra checks here.
 		// TODO: Due to the accuracy requirements of the API "/regions/check/xxx",
-		// region stats needs to be collected in API mode.
+		// region stats needs to be collected in microservice env.
 		// We need to think of a better way to reduce this part of the cost in the future.
 		if hasRegionStats && c.regionStats.RegionStatsNeedUpdate(region) {
 			ctx.MiscRunner.RunTask(
@@ -1250,7 +1250,7 @@ func (c *RaftCluster) processRegionHeartbeat(ctx *core.MetaProcessContext, regio
 			ratelimit.CollectRegionStatsAsync,
 			func(ctx context.Context) {
 				// TODO: Due to the accuracy requirements of the API "/regions/check/xxx",
-				// region stats needs to be collected in API mode.
+				// region stats needs to be collected in microservice env.
 				// We need to think of a better way to reduce this part of the cost in the future.
 				cluster.Collect(ctx, c, region)
 			},
diff --git a/server/config/service_middleware_config.go b/server/config/service_middleware_config.go
index 223e19dba12..c2fc59c2a82 100644
--- a/server/config/service_middleware_config.go
+++ b/server/config/service_middleware_config.go
@@ -22,7 +22,7 @@ const (
 	defaultEnableGRPCRateLimitMiddleware = true
 )
 
-// ServiceMiddlewareConfig is the configuration for PD Service middleware.
+// ServiceMiddlewareConfig is the configuration for PD middleware.
 type ServiceMiddlewareConfig struct {
 	AuditConfig         `json:"audit"`
 	RateLimitConfig     `json:"rate-limit"`
diff --git a/server/config/service_middleware_persist_options.go b/server/config/service_middleware_persist_options.go
index d59d23146f7..dfb266581bc 100644
--- a/server/config/service_middleware_persist_options.go
+++ b/server/config/service_middleware_persist_options.go
@@ -40,7 +40,7 @@ func NewServiceMiddlewarePersistOptions(cfg *ServiceMiddlewareConfig) *ServiceMi
 	return o
 }
 
-// GetAuditConfig returns pd service middleware configurations.
+// GetAuditConfig returns PD middleware configurations.
 func (o *ServiceMiddlewarePersistOptions) GetAuditConfig() *AuditConfig {
 	return o.audit.Load().(*AuditConfig)
 }
diff --git a/tests/integrations/mcs/tso/api_test.go b/tests/integrations/mcs/tso/api_test.go
index aa153a7eb9f..b28f0a61738 100644
--- a/tests/integrations/mcs/tso/api_test.go
+++ b/tests/integrations/mcs/tso/api_test.go
@@ -227,7 +227,7 @@ func TestForwardOnlyTSONoScheduling(t *testing.T) {
 		testutil.StatusOK(re), testutil.StringContain(re, "Reset ts successfully"), testutil.WithHeader(re, apiutil.XForwardedToMicroserviceHeader, "true"))
 	re.NoError(err)
 
-	// If close tso server, it should try forward to tso server, but return error in pd service mode.
+	// If close tso server, it should try forward to tso server, but return error in non-serverless env.
 	ttc.Destroy()
 	err = testutil.CheckPostJSON(tests.TestDialClient, fmt.Sprintf("%s/%s", urlPrefix, "admin/reset-ts"), input,
 		testutil.Status(re, http.StatusInternalServerError), testutil.StringContain(re, "[PD:apiutil:ErrRedirect]redirect failed"))
diff --git a/tests/integrations/tso/client_test.go b/tests/integrations/tso/client_test.go
index 4822d6439ca..4b8551c2930 100644
--- a/tests/integrations/tso/client_test.go
+++ b/tests/integrations/tso/client_test.go
@@ -553,7 +553,7 @@ func TestUpgradingPDAndTSOClusters(t *testing.T) {
 	pdLeader := pdCluster.GetServer(leaderName)
 	backendEndpoints := pdLeader.GetAddr()
 
-	// Create a pd client in PD mode to let the API leader to forward requests to the TSO cluster.
+	// Create a PD client in microservice env to let the PD leader to forward requests to the TSO cluster.
 	re.NoError(failpoint.Enable("github.com/tikv/pd/client/servicediscovery/usePDServiceMode", "return(true)"))
 	pdClient, err := pd.NewClientWithContext(context.Background(),
 		caller.TestComponent,
diff --git a/tools/pd-ctl/pdctl/command/config_command.go b/tools/pd-ctl/pdctl/command/config_command.go
index f0912c07c53..b9ab43fddff 100644
--- a/tools/pd-ctl/pdctl/command/config_command.go
+++ b/tools/pd-ctl/pdctl/command/config_command.go
@@ -49,7 +49,7 @@ const (
 	ruleBundlePrefix              = "pd/api/v1/config/placement-rule"
 	pdServerPrefix                = "pd/api/v1/config/pd-server"
 	serviceMiddlewareConfigPrefix = "pd/api/v1/service-middleware/config"
-	// flagFromPD has no influence for pd mode, but it is useful for us to debug in pd service mode.
+	// flagFromPD is useful for us to debug.
 	flagFromPD = "from_pd"
 )
 
diff --git a/tools/pd-ctl/pdctl/command/keyspace_command.go b/tools/pd-ctl/pdctl/command/keyspace_command.go
index 2ecee481df4..4fd131a8ffe 100644
--- a/tools/pd-ctl/pdctl/command/keyspace_command.go
+++ b/tools/pd-ctl/pdctl/command/keyspace_command.go
@@ -101,7 +101,7 @@ func showKeyspaceNameCommandFunc(cmd *cobra.Command, args []string) {
 	}
 	resp, err := doRequest(cmd, url, http.MethodGet, http.Header{})
 	// Retry without the force_refresh_group_id if the keyspace group manager is not initialized.
-	// This can happen when PD is not running in API mode.
+	// This can happen when PD is not running in microservice env.
 	if err != nil && refreshGroupID && strings.Contains(err.Error(), handlers.GroupManagerUninitializedErr) {
 		resp, err = doRequest(cmd, fmt.Sprintf("%s/%s", keyspacePrefix, args[0]), http.MethodGet, http.Header{})
 	}
diff --git a/tools/pd-ctl/tests/keyspace/keyspace_group_test.go b/tools/pd-ctl/tests/keyspace/keyspace_group_test.go
index 88ee782ab4b..58c6f5a5762 100644
--- a/tools/pd-ctl/tests/keyspace/keyspace_group_test.go
+++ b/tools/pd-ctl/tests/keyspace/keyspace_group_test.go
@@ -597,7 +597,7 @@ func TestShowKeyspaceGroupPrimary(t *testing.T) {
 	re.NoError(failpoint.Disable("github.com/tikv/pd/server/delayStartServerLoop"))
 }
 
-func TestInPDMode(t *testing.T) {
+func TestCmdWithoutKeyspaceGroupInitialized(t *testing.T) {
 	re := require.New(t)
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()