Expose created time and updated time to datanode metrics (#8173)

Signed-off-by: dragondriver <jiquan.long@zilliz.com>

internal/datanode/data_node.go

@@ -159,6 +159,7 @@ func (node *DataNode) Register() error {
 	log.Debug("DataNode Init",
 		zap.String("MsgChannelSubName", Params.MsgChannelSubName),
 	)
+
 	return nil
 }
 
@@ -342,6 +343,10 @@ func (node *DataNode) Start() error {
 	FilterThreshold = rep.GetTimestamp()
 
 	go node.BackGroundGC(node.clearSignal)
+
+	Params.CreatedTime = time.Now()
+	Params.UpdatedTime = time.Now()
+
 	node.UpdateStateCode(internalpb.StateCode_Healthy)
 	return nil
 }

internal/datanode/metrics_info.go

@@ -39,8 +39,9 @@ func (node *DataNode) getSystemInfoMetrics(ctx context.Context, req *milvuspb.Ge
 				SystemVersion: os.Getenv(metricsinfo.GitCommitEnvKey),
 				DeployMode:    os.Getenv(metricsinfo.DeployModeEnvKey),
 			},
-			// TODO(dragondriver): CreatedTime & UpdatedTime, easy but time-costing
+			CreatedTime: Params.CreatedTime.String(),
-			Type: typeutil.DataNodeRole,
+			UpdatedTime: Params.UpdatedTime.String(),
+			Type:        typeutil.DataNodeRole,
 		},
 		SystemConfigurations: metricsinfo.DataNodeConfiguration{
 			FlushInsertBufferSize: Params.FlushInsertBufferSize,

internal/datanode/param_table.go

@@ -16,6 +16,7 @@ import (
 	"strconv"
 	"strings"
 	"sync"
+	"time"
 
 	"github.com/milvus-io/milvus/internal/log"
 	"github.com/milvus-io/milvus/internal/util/paramtable"
@@ -62,6 +63,9 @@ type ParamTable struct {
 	MinioSecretAccessKey string
 	MinioUseSSL          bool
 	MinioBucketName      string
+
+	CreatedTime time.Time
+	UpdatedTime time.Time
 }
 
 var Params ParamTable

internal/datanode/param_table_test.go

@@ -14,6 +14,7 @@ package datanode
 import (
 	"log"
 	"testing"
+	"time"
 )
 
 func TestParamTable_DataNode(t *testing.T) {
@@ -98,4 +99,14 @@ func TestParamTable_DataNode(t *testing.T) {
 		name := Params.MinioBucketName
 		log.Println("MinioBucketName:", name)
 	})
+
+	t.Run("Test CreatedTime", func(t *testing.T) {
+		Params.CreatedTime = time.Now()
+		log.Println("CreatedTime: ", Params.CreatedTime)
+	})
+
+	t.Run("Test UpdatedTime", func(t *testing.T) {
+		Params.UpdatedTime = time.Now()
+		log.Println("UpdatedTime: ", Params.UpdatedTime)
+	})
 }