etcdctl/check: create new check command for memory usage

Create a new command similar to check perf that can check the memory
consumption for putting different workloads on a given endpoint. If no endpoint
is provided, localhost will be used. Return user with a message that whether
there are enough memory for a given workload with pass or fail.

Fixed #9121

etcdctl/ctlv3/command/check.go

@@ -400,22 +400,15 @@ func newCheckDatascaleCommand(cmd *cobra.Command, args []string) {
 	}
 
 	bytesUsed := bytesAfter - bytesBefore
+	mbUsed := bytesUsed / (1024 * 1024)
 
-	ok = true
 	if len(s.ErrorDist) != 0 {
 		fmt.Println("FAIL: too many errors")
 		for k, v := range s.ErrorDist {
 			fmt.Printf("FAIL: ERROR(%v) -> %d\n", k, v)
 		}
-		ok = false
-	}
-
-	mbUsed := bytesUsed / (1024 * 1024)
-
-	if ok {
-		fmt.Println(fmt.Sprintf("PASS: Approximate system memory used : %v MB.", strconv.FormatFloat(float64(mbUsed), 'f', 2, 64)))
-	} else {
-		fmt.Println("FAIL: Memory usage could not be determined.")
 		os.Exit(ExitError)
+	} else {
+		fmt.Println(fmt.Sprintf("PASS: Approximate system memory used : %v MB.", strconv.FormatFloat(float64(mbUsed), 'f', 2, 64)))
 	}
 }