Fixed compilation error with channel type in LogOnCue. Added more thorough logging to pass golint errors.

log.go

@@ -8,18 +8,21 @@ type Logger interface {
 	Printf(format string, v ...interface{})
 }
 
+// Log outputs each metric in the given registry periodically using the given logger.
 func Log(r Registry, freq time.Duration, l Logger) {
 	LogScaled(r, freq, time.Nanosecond, l)
 }
 
+// LogOnCue outputs each metric in the given registry on demand through the channel
+// using the given logger
 func LogOnCue(r Registry, ch chan interface{}, l Logger) {
 	LogScaledOnCue(r, ch, time.Nanosecond, l)
 }
 
-// Output each metric in the given registry periodically using the given
+// LogScaled outputs each metric in the given registry periodically using the given
 // logger. Print timings in `scale` units (eg time.Millisecond) rather than nanos.
 func LogScaled(r Registry, freq time.Duration, scale time.Duration, l Logger) {
-	ch := make(chan struct{}, 1)
+	ch := make(chan interface{}, 1)
 	go func() {
 		for range time.Tick(freq) {
 			ch <- struct{}{}
@@ -28,8 +31,9 @@ func LogScaled(r Registry, freq time.Duration, scale time.Duration, l Logger) {
 	LogScaledOnCue(r, ch, scale, l)
 }
 
-// Output each metric in the given registry on demand through the channel using the given
-// logger. Print timings in `scale` units (eg time.Millisecond) rather than nanos.
+// LogScaledOnCue outputs each metric in the given registry on demand through the channel
+// using the given logger. Print timings in `scale` units (eg time.Millisecond) rather
+// than nanos.
 func LogScaledOnCue(r Registry, ch chan interface{}, scale time.Duration, l Logger) {
 	du := float64(scale)
 	duSuffix := scale.String()[1:]