[metricbeat] Add divide by zero check to docker/diskio (#15649)

fearful-symmetry · web-flow · commit c7e137c4f72a · 2020-01-21T08:57:52.000-08:00
* add NaN check to docker/diskio

* return 0
diff --git a/metricbeat/module/docker/diskio/helper.go b/metricbeat/module/docker/diskio/helper.go
@@ -174,5 +174,11 @@ func calculatePerSecond(duration time.Duration, old uint64, new uint64) float64
 	if value < 0 {
 		value = 0
 	}
-	return value / duration.Seconds()
+
+	timeSec := duration.Seconds()
+	if timeSec == 0 {
+		return 0
+	}
+
+	return value / timeSec
 }

Original file line number	Diff line number	Diff line change
`@@ -174,5 +174,11 @@ func calculatePerSecond(duration time.Duration, old uint64, new uint64) float64`
`174`	`174`	`if value < 0 {`
`175`	`175`	`value = 0`
`176`	`176`	`}`
`177`		`- return value / duration.Seconds()`
	`177`	`+`
	`178`	`+ timeSec := duration.Seconds()`
	`179`	`+ if timeSec == 0 {`
	`180`	`+ return 0`
	`181`	`+ }`
	`182`	`+`
	`183`	`+ return value / timeSec`
`178`	`184`	`}`