// Timed returns an http.Handler that starts a timer, passes requests to an
// underlying http.Handler, stops the timer, and updates the timer via
// go-kit/kit/metrics.
func Timed(handler http.Handler, name string, p provider.Provider) *Timer {
hist, err := p.NewHistogram(name,
fmt.Sprintf("tracking request duration for %q", name),
0, 1500000, 4, // 0-15 minute time range, 4 sigfigs
50, 75, 90, 95, 99) // quantiles
if err != nil {
panic("invalid histogram settings")
}
return &Timer{
TimeHistogram: metrics.NewTimeHistogram(time.Millisecond, hist),
handler: handler,
}
}
func registerRPCMetrics(name string, mets provider.Provider) {
name = "rpc." + name
hist, err := mets.NewHistogram(name+".DURATION",
fmt.Sprintf("tracking request duration for %q", name),
0, 1500000, 4, // 0-15min time range
50, 75, 90, 95, 99)
if err != nil {
panic(fmt.Sprint("invalid histogram settings: ", err))
}
rpcEndpointMetrics[name] = &rpcMetrics{
Timer: metrics.NewTimeHistogram(time.Millisecond, hist),
SuccessCounter: mets.NewCounter(name+".SUCCESS",
fmt.Sprintf("counting successful repsonses for %s", name)),
ErrorCounter: mets.NewCounter(name+".ERROR",
fmt.Sprintf("counting error responses for %s", name)),
PanicCounter: mets.NewCounter(name+".PANIC",
fmt.Sprintf("counting paniced responses for %s", name)),
}
}