Use a exponentially-decaying sample for the 'recent' histogram

metrics.go

@@ -11,11 +11,10 @@ import (
 var qCounter = metrics.NewMeter()
 
 type ServerMetrics struct {
-	lastQueryCount       int64
-	queriesHistogram10   *metrics.StandardHistogram
-	queriesHistogram60   *metrics.StandardHistogram
-	queriesHistogram1440 *metrics.StandardHistogram
-	goroutines           *metrics.StandardGauge
+	lastQueryCount         int64
+	queriesHistogram       *metrics.StandardHistogram
+	queriesHistogramRecent *metrics.StandardHistogram
+	goroutines             *metrics.StandardGauge
 }
 
 func NewMetrics() *ServerMetrics {
@@ -24,14 +23,11 @@ func NewMetrics() *ServerMetrics {
 	m.lastQueryCount = qCounter.Count()
 	metrics.Register("queries", qCounter)
 
-	m.queriesHistogram10 = metrics.NewHistogram(metrics.NewUniformSample(600))
-	metrics.Register("queries-histogram10", m.queriesHistogram10)
+	m.queriesHistogram = metrics.NewHistogram(metrics.NewUniformSample(1800))
+	metrics.Register("queries-histogram", m.queriesHistogram)
 
-	m.queriesHistogram60 = metrics.NewHistogram(metrics.NewUniformSample(3600))
-	metrics.Register("queries-histogram60", m.queriesHistogram60)
-
-	m.queriesHistogram1440 = metrics.NewHistogram(metrics.NewUniformSample(24 * 60 * 60))
-	metrics.Register("queries-histogram1440", m.queriesHistogram1440)
+	m.queriesHistogramRecent = metrics.NewHistogram(metrics.NewExpDecaySample(600, 0.015))
+	metrics.Register("queries-histogram-recent", m.queriesHistogramRecent)
 
 	m.goroutines = metrics.NewGauge()
 	metrics.Register("goroutines", m.goroutines)
@@ -55,9 +51,8 @@ func (m *ServerMetrics) Updater() {
 		newQueries := current - m.lastQueryCount
 		m.lastQueryCount = current
 
-		m.queriesHistogram10.Update(newQueries)
-		m.queriesHistogram60.Update(newQueries)
-		m.queriesHistogram1440.Update(newQueries)
+		m.queriesHistogram.Update(newQueries)
+		m.queriesHistogramRecent.Update(newQueries)
 
 		m.goroutines.Update(int64(runtime.NumGoroutine()))
 

monitor.go

@@ -229,7 +229,6 @@ func round(val float64, prec int) float64 {
 }
 
 type histogramData struct {
-	Count  int64
 	Max    int64
 	Min    int64
 	Mean   float64
@@ -240,7 +239,6 @@ type histogramData struct {
 }
 
 func setupHistogramData(met *metrics.StandardHistogram, dat *histogramData) {
-	dat.Count = met.Count()
 	dat.Max = met.Max()
 	dat.Min = met.Min()
 	dat.Mean = met.Mean()
@@ -282,10 +280,9 @@ func StatusServer(zones Zones) func(http.ResponseWriter, *http.Request) {
 			Zones   Rates
 			Uptime  DayDuration
 			Global  struct {
-				Queries       *metrics.StandardMeter
-				Histogram10   histogramData
-				Histogram60   histogramData
-				Histogram1440 histogramData
+				Queries         *metrics.StandardMeter
+				Histogram       histogramData
+				HistogramRecent histogramData
 			}
 		}
 
@@ -299,9 +296,8 @@ func StatusServer(zones Zones) func(http.ResponseWriter, *http.Request) {
 
 		status.Global.Queries = metrics.Get("queries").(*metrics.StandardMeter)
 
-		setupHistogramData(metrics.Get("queries-histogram10").(*metrics.StandardHistogram), &status.Global.Histogram10)
-		setupHistogramData(metrics.Get("queries-histogram60").(*metrics.StandardHistogram), &status.Global.Histogram60)
-		setupHistogramData(metrics.Get("queries-histogram1440").(*metrics.StandardHistogram), &status.Global.Histogram1440)
+		setupHistogramData(metrics.Get("queries-histogram").(*metrics.StandardHistogram), &status.Global.Histogram)
+		setupHistogramData(metrics.Get("queries-histogram-recent").(*metrics.StandardHistogram), &status.Global.HistogramRecent)
 
 		err = tmpl.Execute(w, status)
 		if err != nil {

status.html

@@ -45,36 +45,25 @@
 			</tr>
 
 			<tr>
-				<td>10 minutes <small>({{.Global.Histogram10.Count}})</small></td>
-				<td>{{printf "%d"   .Global.Histogram10.Min}}</td>
-				<td>{{printf "%.2f" .Global.Histogram10.Mean}}</td>
-				<td>{{printf "%.2f" .Global.Histogram10.Pct90 }}</td>
-				<td>{{printf "%.2f" .Global.Histogram10.Pct99 }}</td>
-				<td>{{printf "%.2f" .Global.Histogram10.Pct999 }}</td>
-				<td>{{printf "%d"   .Global.Histogram10.Max}}</td>
-				<td>{{printf "%.2f" .Global.Histogram10.StdDev }}</td>
+				<td>Since start</td>
+				<td>{{printf "%d"   .Global.Histogram.Min}}</td>
+				<td>{{printf "%.2f" .Global.Histogram.Mean}}</td>
+				<td>{{printf "%.2f" .Global.Histogram.Pct90 }}</td>
+				<td>{{printf "%.2f" .Global.Histogram.Pct99 }}</td>
+				<td>{{printf "%.2f" .Global.Histogram.Pct999 }}</td>
+				<td>{{printf "%d"   .Global.Histogram.Max}}</td>
+				<td>{{printf "%.2f" .Global.Histogram.StdDev }}</td>
 			</tr>
 
 			<tr>
-				<td>60 minutes <small>({{.Global.Histogram60.Count}})</small></td>
-				<td>{{printf "%d"   .Global.Histogram60.Min}}</td>
-				<td>{{printf "%.2f" .Global.Histogram60.Mean}}</td>
-				<td>{{printf "%.2f" .Global.Histogram60.Pct90 }}</td>
-				<td>{{printf "%.2f" .Global.Histogram60.Pct99 }}</td>
-				<td>{{printf "%.2f" .Global.Histogram60.Pct999 }}</td>
-				<td>{{printf "%d"   .Global.Histogram60.Max}}</td>
-				<td>{{printf "%.2f" .Global.Histogram60.StdDev }}</td>
-			</tr>
-
-			<tr>
-				<td>1 day <small>({{.Global.Histogram1440.Count}})</small></td>
-				<td>{{printf "%d"   .Global.Histogram1440.Min}}</td>
-				<td>{{printf "%.2f" .Global.Histogram1440.Mean}}</td>
-				<td>{{printf "%.2f" .Global.Histogram1440.Pct90 }}</td>
-				<td>{{printf "%.2f" .Global.Histogram1440.Pct99 }}</td>
-				<td>{{printf "%.2f" .Global.Histogram1440.Pct999 }}</td>
-				<td>{{printf "%d"   .Global.Histogram1440.Max}}</td>
-				<td>{{printf "%.2f" .Global.Histogram1440.StdDev }}</td>
+				<td>Recent</td>
+				<td>{{printf "%d"   .Global.HistogramRecent.Min}}</td>
+				<td>{{printf "%.2f" .Global.HistogramRecent.Mean}}</td>
+				<td>{{printf "%.2f" .Global.HistogramRecent.Pct90 }}</td>
+				<td>{{printf "%.2f" .Global.HistogramRecent.Pct99 }}</td>
+				<td>{{printf "%.2f" .Global.HistogramRecent.Pct999 }}</td>
+				<td>{{printf "%d"   .Global.HistogramRecent.Max}}</td>
+				<td>{{printf "%.2f" .Global.HistogramRecent.StdDev }}</td>
 			</tr>
 
 		</table>

status.html.go

@@ -11,72 +11,66 @@ import (
 // status_html returns raw, uncompressed file data.
 func status_html() []byte {
 	gz, err := gzip.NewReader(bytes.NewBuffer([]byte{
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+0x71,0x3d,0x9d,0x6b,0xb1,0x3d,0xfc,0x6b,0xb3,0x3d,0x5c,0xac,
+0xcb,0xf6,0xf0,0xb2,0xa2,0x1e,0x71,0xb4,0x75,0xf8,0x44,0xa1,
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+0x8e,0x8a,0x9e,0xf7,0x8c,0xb0,0x41,0x86,0x15,0x62,0x5a,0x8b,
+0x3a,0x30,0xb7,0x5d,0xc9,0xe3,0xc3,0xb4,0x42,0x4a,0xe1,0xf3,
+0x5c,0x33,0xb9,0x00,0xeb,0x76,0x91,0xaa,0xb5,0xc6,0x55,0x82,
+0xba,0xad,0x50,0xa5,0x9e,0x55,0x4d,0x65,0xce,0x86,0xf1,0xb0,
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+0x31,0x87,0xba,0xe9,0xc9,0x9c,0xa1,0x07,0x67,0xe0,0x43,0xda,
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+0xd2,0xf8,0x54,0xbf,0xcb,0x3b,0xb5,0x98,0xbd,0x78,0xbe,0xc4,
+0x2e,0x25,0xf2,0x1c,0x24,0x77,0x5b,0x6a,0xf3,0x9b,0x6c,0xfe,
+0x92,0xf2,0x2e,0x6a,0x7f,0x0e,0x77,0xb1,0xef,0xff,0x09,0x00,
+0x00,0xff,0xff,0x48,0x16,0xe4,0x27,0xe0,0x0b,0x00,0x00,
 	}))
 
 	if err != nil {