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Signed-off-by: Sergey Shevchenko <[email protected]>
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102 changes: 102 additions & 0 deletions
102
...ter-autoscaler/cloudprovider/hetzner/hcloud-go/hcloud/internal/instrumentation/metrics.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,102 @@ | ||
| /* | ||
| Copyright 2018 The Kubernetes Authors. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
|
||
| package instrumentation | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "net/http" | ||
| "regexp" | ||
| "strconv" | ||
| "strings" | ||
|
|
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| "github.com/prometheus/client_golang/prometheus" | ||
| "github.com/prometheus/client_golang/prometheus/promhttp" | ||
| ) | ||
|
|
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| type Instrumenter struct { | ||
| subsystemIdentifier string // will be used as part of the metric name (hcloud_<identifier>_requests_total) | ||
| instrumentationRegistry *prometheus.Registry | ||
| } | ||
|
|
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| // New creates a new Instrumenter. The subsystemIdentifier will be used as part of the metric names (e.g. hcloud_<identifier>_requests_total) | ||
| func New(subsystemIdentifier string, instrumentationRegistry *prometheus.Registry) *Instrumenter { | ||
| return &Instrumenter{subsystemIdentifier: subsystemIdentifier, instrumentationRegistry: instrumentationRegistry} | ||
| } | ||
|
|
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| // InstrumentedRoundTripper returns an instrumented round tripper. | ||
| func (i *Instrumenter) InstrumentedRoundTripper() http.RoundTripper { | ||
| inFlightRequestsGauge := prometheus.NewGauge(prometheus.GaugeOpts{ | ||
| Name: fmt.Sprintf("hcloud_%s_in_flight_requests", i.subsystemIdentifier), | ||
| Help: fmt.Sprintf("A gauge of in-flight requests to the hcloud %s.", i.subsystemIdentifier), | ||
| }) | ||
|
|
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| requestsPerEndpointCounter := prometheus.NewCounterVec( | ||
| prometheus.CounterOpts{ | ||
| Name: fmt.Sprintf("hcloud_%s_requests_total", i.subsystemIdentifier), | ||
| Help: fmt.Sprintf("A counter for requests to the hcloud %s per endpoint.", i.subsystemIdentifier), | ||
| }, | ||
| []string{"code", "method", "api_endpoint"}, | ||
| ) | ||
|
|
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| requestLatencyHistogram := prometheus.NewHistogramVec( | ||
| prometheus.HistogramOpts{ | ||
| Name: fmt.Sprintf("hcloud_%s_request_duration_seconds", i.subsystemIdentifier), | ||
| Help: fmt.Sprintf("A histogram of request latencies to the hcloud %s .", i.subsystemIdentifier), | ||
| Buckets: prometheus.DefBuckets, | ||
| }, | ||
| []string{"method"}, | ||
| ) | ||
|
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| i.instrumentationRegistry.MustRegister(requestsPerEndpointCounter, requestLatencyHistogram, inFlightRequestsGauge) | ||
|
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| return promhttp.InstrumentRoundTripperInFlight(inFlightRequestsGauge, | ||
| promhttp.InstrumentRoundTripperDuration(requestLatencyHistogram, | ||
| i.instrumentRoundTripperEndpoint(requestsPerEndpointCounter, | ||
| http.DefaultTransport, | ||
| ), | ||
| ), | ||
| ) | ||
| } | ||
|
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| // instrumentRoundTripperEndpoint implements a hcloud specific round tripper to count requests per API endpoint | ||
| // numeric IDs are removed from the URI Path. | ||
| // Sample: | ||
| // /volumes/1234/actions/attach --> /volumes/actions/attach | ||
| func (i *Instrumenter) instrumentRoundTripperEndpoint(counter *prometheus.CounterVec, next http.RoundTripper) promhttp.RoundTripperFunc { | ||
| return func(r *http.Request) (*http.Response, error) { | ||
| resp, err := next.RoundTrip(r) | ||
| if err == nil { | ||
| statusCode := strconv.Itoa(resp.StatusCode) | ||
| counter.WithLabelValues(statusCode, strings.ToLower(resp.Request.Method), preparePathForLabel(resp.Request.URL.Path)).Inc() | ||
| } | ||
| return resp, err | ||
| } | ||
| } | ||
|
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| func preparePathForLabel(path string) string { | ||
| path = strings.ToLower(path) | ||
|
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| // replace all numbers and chars that are not a-z, / or _ | ||
| reg := regexp.MustCompile("[^a-z/_]+") | ||
| path = reg.ReplaceAllString(path, "") | ||
|
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| // replace all artifacts of number replacement (//) | ||
| path = strings.ReplaceAll(path, "//", "/") | ||
|
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| // replace the /v/ that indicated the API version | ||
| return strings.Replace(path, "/v/", "/", 1) | ||
| } |
45 changes: 45 additions & 0 deletions
45
...utoscaler/cloudprovider/hetzner/hcloud-go/hcloud/internal/instrumentation/metrics_test.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,45 @@ | ||
| /* | ||
| Copyright 2018 The Kubernetes Authors. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
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| package instrumentation | ||
|
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| import "testing" | ||
|
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| func Test_preparePath(t *testing.T) { | ||
| tests := []struct { | ||
| name string | ||
| path string | ||
| want string | ||
| }{ | ||
| { | ||
| "simple test", | ||
| "/v1/volumes/123456", | ||
| "/volumes/", | ||
| }, | ||
| { | ||
| "simple test", | ||
| "/v1/volumes/123456/actions/attach", | ||
| "/volumes/actions/attach", | ||
| }, | ||
| } | ||
| for _, tt := range tests { | ||
| t.Run(tt.name, func(t *testing.T) { | ||
| if got := preparePathForLabel(tt.path); got != tt.want { | ||
| t.Errorf("preparePathForLabel() = %v, want %v", got, tt.want) | ||
| } | ||
| }) | ||
| } | ||
| } |
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