make JSON output logging less noisy

Increase time interval between log message to 200 milliseconds
Remove Writing JSON metrics message
Add if statement output log based on no of count

stats/json/collector.go

@@ -98,8 +98,9 @@ func (c *Collector) Init() error {
 func (c *Collector) SetRunStatus(status lib.RunStatus) {}
 
 func (c *Collector) Run(ctx context.Context) {
+	const timeout = 200
 	logrus.Debug("JSON output: Running!")
-	ticker := time.NewTicker(time.Millisecond * 100)
+	ticker := time.NewTicker(time.Millisecond * timeout)
 	defer func() {
 		_ = c.closeFn()
 	}()
@@ -142,7 +143,6 @@ func (c *Collector) commit() {
 	samples := c.buffer
 	c.buffer = nil
 	c.bufferLock.Unlock()
-	logrus.WithField("filename", c.fname).Debug("JSON: Writing JSON metrics")
 	var start = time.Now()
 	var count int
 	for _, sc := range samples {
@@ -160,8 +160,10 @@ func (c *Collector) commit() {
 			}
 		}
 	}
-	logrus.WithField("filename", c.fname).WithField("t", time.Since(start)).
-		WithField("count", count).Debug("JSON: Wrote JSON metrics")
+	if count > 0 {
+		logrus.WithField("filename", c.fname).WithField("t", time.Since(start)).
+			WithField("count", count).Debug("JSON: Wrote JSON metrics")
+	}
 }
 
 func (c *Collector) Link() string {