优化只保留5位小数 (#878)

* 优化只保留5位小数

* 优化小数点保留方法

src/server/router/router_openfalcon.go

@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"io/ioutil"
+	"math"
 	"strconv"
 	"strings"
 	"time"
@@ -52,6 +53,8 @@ func (m *FalconMetric) Clean(ts int64) error {
 		return fmt.Errorf("unparseable value %v", v)
 	}
 
+	m.Value = math.Round(m.Value*100000) / 100000
+
 	// if timestamp bigger than 32 bits, likely in milliseconds
 	if m.Timestamp > 0xffffffff {
 		m.Timestamp /= 1000

src/server/router/router_opentsdb.go

@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"io/ioutil"
+	"math"
 	"strconv"
 	"strings"
 	"time"
@@ -52,6 +53,8 @@ func (m *HTTPMetric) Clean(ts int64) error {
 		return fmt.Errorf("unparseable value %v", v)
 	}
 
+	m.Value = math.Round(m.Value*100000) / 100000
+
 	// if timestamp bigger than 32 bits, likely in milliseconds
 	if m.Timestamp > 0xffffffff {
 		m.Timestamp /= 1000