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[release-0.14] ✨ Add rest client request duration and size metrics #2218

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merged 1 commit into from Mar 1, 2023
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[release-0.14] ✨ Add rest client request duration and size metrics #2218

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59 changes: 53 additions & 6 deletions pkg/metrics/client_go_adapter.go
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Expand Up @@ -62,11 +62,44 @@ var (
Buckets: prometheus.ExponentialBuckets(0.001, 2, 10),
}, []string{"verb", "url"})

requestResult = prometheus.NewCounterVec(prometheus.CounterOpts{
Subsystem: RestClientSubsystem,
Name: ResultKey,
Help: "Number of HTTP requests, partitioned by status code, method, and host.",
}, []string{"code", "method", "host"})
// requestLatency is a Prometheus Histogram metric type partitioned by
// "verb", and "host" labels. It is used for the rest client latency metrics.
requestLatency = prometheus.NewHistogramVec(
prometheus.HistogramOpts{
Name: "rest_client_request_duration_seconds",
Help: "Request latency in seconds. Broken down by verb, and host.",
Buckets: []float64{0.005, 0.025, 0.1, 0.25, 0.5, 1.0, 2.0, 4.0, 8.0, 15.0, 30.0, 60.0},
},
[]string{"verb", "host"},
)

requestSize = prometheus.NewHistogramVec(
prometheus.HistogramOpts{
Name: "rest_client_request_size_bytes",
Help: "Request size in bytes. Broken down by verb and host.",
// 64 bytes to 16MB
Buckets: []float64{64, 256, 512, 1024, 4096, 16384, 65536, 262144, 1048576, 4194304, 16777216},
},
[]string{"verb", "host"},
)

responseSize = prometheus.NewHistogramVec(
prometheus.HistogramOpts{
Name: "rest_client_response_size_bytes",
Help: "Response size in bytes. Broken down by verb and host.",
// 64 bytes to 16MB
Buckets: []float64{64, 256, 512, 1024, 4096, 16384, 65536, 262144, 1048576, 4194304, 16777216},
},
[]string{"verb", "host"},
)

requestResult = prometheus.NewCounterVec(
prometheus.CounterOpts{
Name: "rest_client_requests_total",
Help: "Number of HTTP requests, partitioned by status code, method, and host.",
},
[]string{"code", "method", "host"},
)
)

func init() {
Expand All @@ -76,11 +109,17 @@ func init() {
// registerClientMetrics sets up the client latency metrics from client-go.
func registerClientMetrics() {
// register the metrics with our registry
Registry.MustRegister(requestLatency)
Registry.MustRegister(requestSize)
Registry.MustRegister(responseSize)
Registry.MustRegister(requestResult)

// register the metrics with client-go
clientmetrics.Register(clientmetrics.RegisterOpts{
RequestResult: &resultAdapter{metric: requestResult},
RequestLatency: &LatencyAdapter{metric: requestLatency},
RequestSize: &sizeAdapter{metric: requestSize},
ResponseSize: &sizeAdapter{metric: responseSize},
RequestResult: &resultAdapter{metric: requestResult},
})
}

Expand All @@ -102,6 +141,14 @@ func (l *LatencyAdapter) Observe(_ context.Context, verb string, u url.URL, late
l.metric.WithLabelValues(verb, u.String()).Observe(latency.Seconds())
}

type sizeAdapter struct {
metric *prometheus.HistogramVec
}

func (s *sizeAdapter) Observe(ctx context.Context, verb string, host string, size float64) {
s.metric.WithLabelValues(verb, host).Observe(size)
}

type resultAdapter struct {
metric *prometheus.CounterVec
}
Expand Down