mirror of
https://github.com/ceph/ceph-csi.git
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858 lines
32 KiB
Go
858 lines
32 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package metrics
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import (
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"context"
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"net/http"
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"net/url"
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"strconv"
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"strings"
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"sync"
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"time"
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restful "github.com/emicklei/go-restful/v3"
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"k8s.io/apimachinery/pkg/apis/meta/v1/validation"
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"k8s.io/apimachinery/pkg/types"
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utilsets "k8s.io/apimachinery/pkg/util/sets"
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"k8s.io/apiserver/pkg/audit"
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"k8s.io/apiserver/pkg/authentication/user"
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"k8s.io/apiserver/pkg/endpoints/request"
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"k8s.io/apiserver/pkg/endpoints/responsewriter"
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compbasemetrics "k8s.io/component-base/metrics"
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"k8s.io/component-base/metrics/legacyregistry"
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)
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// resettableCollector is the interface implemented by prometheus.MetricVec
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// that can be used by Prometheus to collect metrics and reset their values.
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type resettableCollector interface {
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compbasemetrics.Registerable
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Reset()
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}
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const (
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APIServerComponent string = "apiserver"
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OtherRequestMethod string = "other"
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)
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/*
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* By default, all the following metrics are defined as falling under
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* ALPHA stability level https://github.com/kubernetes/enhancements/blob/master/keps/sig-instrumentation/1209-metrics-stability/kubernetes-control-plane-metrics-stability.md#stability-classes)
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*
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* Promoting the stability level of the metric is a responsibility of the component owner, since it
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* involves explicitly acknowledging support for the metric across multiple releases, in accordance with
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* the metric stability policy.
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*/
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var (
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deprecatedRequestGauge = compbasemetrics.NewGaugeVec(
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&compbasemetrics.GaugeOpts{
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Subsystem: APIServerComponent,
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Name: "requested_deprecated_apis",
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Help: "Gauge of deprecated APIs that have been requested, broken out by API group, version, resource, subresource, and removed_release.",
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StabilityLevel: compbasemetrics.STABLE,
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},
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[]string{"group", "version", "resource", "subresource", "removed_release"},
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)
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// TODO(a-robinson): Add unit tests for the handling of these metrics once
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// the upstream library supports it.
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requestCounter = compbasemetrics.NewCounterVec(
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&compbasemetrics.CounterOpts{
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Subsystem: APIServerComponent,
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Name: "request_total",
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Help: "Counter of apiserver requests broken out for each verb, dry run value, group, version, resource, scope, component, and HTTP response code.",
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StabilityLevel: compbasemetrics.STABLE,
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},
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[]string{"verb", "dry_run", "group", "version", "resource", "subresource", "scope", "component", "code"},
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)
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longRunningRequestsGauge = compbasemetrics.NewGaugeVec(
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&compbasemetrics.GaugeOpts{
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Subsystem: APIServerComponent,
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Name: "longrunning_requests",
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Help: "Gauge of all active long-running apiserver requests broken out by verb, group, version, resource, scope and component. Not all requests are tracked this way.",
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StabilityLevel: compbasemetrics.STABLE,
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},
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[]string{"verb", "group", "version", "resource", "subresource", "scope", "component"},
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)
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requestLatencies = compbasemetrics.NewHistogramVec(
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&compbasemetrics.HistogramOpts{
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Subsystem: APIServerComponent,
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Name: "request_duration_seconds",
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Help: "Response latency distribution in seconds for each verb, dry run value, group, version, resource, subresource, scope and component.",
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// This metric is used for verifying api call latencies SLO,
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// as well as tracking regressions in this aspects.
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// Thus we customize buckets significantly, to empower both usecases.
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Buckets: []float64{0.005, 0.025, 0.05, 0.1, 0.2, 0.4, 0.6, 0.8, 1.0, 1.25, 1.5, 2, 3,
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4, 5, 6, 8, 10, 15, 20, 30, 45, 60},
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StabilityLevel: compbasemetrics.STABLE,
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},
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[]string{"verb", "dry_run", "group", "version", "resource", "subresource", "scope", "component"},
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)
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requestSloLatencies = compbasemetrics.NewHistogramVec(
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&compbasemetrics.HistogramOpts{
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Subsystem: APIServerComponent,
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Name: "request_slo_duration_seconds",
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Help: "Response latency distribution (not counting webhook duration and priority & fairness queue wait times) in seconds for each verb, group, version, resource, subresource, scope and component.",
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// This metric is supplementary to the requestLatencies metric.
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// It measures request duration excluding webhooks as they are mostly
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// dependant on user configuration.
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Buckets: []float64{0.05, 0.1, 0.2, 0.4, 0.6, 0.8, 1.0, 1.25, 1.5, 2, 3,
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4, 5, 6, 8, 10, 15, 20, 30, 45, 60},
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StabilityLevel: compbasemetrics.ALPHA,
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DeprecatedVersion: "1.27.0",
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},
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[]string{"verb", "group", "version", "resource", "subresource", "scope", "component"},
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)
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requestSliLatencies = compbasemetrics.NewHistogramVec(
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&compbasemetrics.HistogramOpts{
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Subsystem: APIServerComponent,
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Name: "request_sli_duration_seconds",
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Help: "Response latency distribution (not counting webhook duration and priority & fairness queue wait times) in seconds for each verb, group, version, resource, subresource, scope and component.",
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// This metric is supplementary to the requestLatencies metric.
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// It measures request duration excluding webhooks as they are mostly
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// dependant on user configuration.
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Buckets: []float64{0.05, 0.1, 0.2, 0.4, 0.6, 0.8, 1.0, 1.25, 1.5, 2, 3,
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4, 5, 6, 8, 10, 15, 20, 30, 45, 60},
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StabilityLevel: compbasemetrics.ALPHA,
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},
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[]string{"verb", "group", "version", "resource", "subresource", "scope", "component"},
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)
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fieldValidationRequestLatencies = compbasemetrics.NewHistogramVec(
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&compbasemetrics.HistogramOpts{
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Name: "field_validation_request_duration_seconds",
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Help: "Response latency distribution in seconds for each field validation value",
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// This metric is supplementary to the requestLatencies metric.
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// It measures request durations for the various field validation
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// values.
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Buckets: []float64{0.05, 0.1, 0.2, 0.4, 0.6, 0.8, 1.0, 1.25, 1.5, 2, 3,
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4, 5, 6, 8, 10, 15, 20, 30, 45, 60},
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StabilityLevel: compbasemetrics.ALPHA,
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},
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[]string{"field_validation"},
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)
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responseSizes = compbasemetrics.NewHistogramVec(
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&compbasemetrics.HistogramOpts{
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Subsystem: APIServerComponent,
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Name: "response_sizes",
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Help: "Response size distribution in bytes for each group, version, verb, resource, subresource, scope and component.",
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// Use buckets ranging from 1000 bytes (1KB) to 10^9 bytes (1GB).
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Buckets: compbasemetrics.ExponentialBuckets(1000, 10.0, 7),
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StabilityLevel: compbasemetrics.STABLE,
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},
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[]string{"verb", "group", "version", "resource", "subresource", "scope", "component"},
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)
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// TLSHandshakeErrors is a number of requests dropped with 'TLS handshake error from' error
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TLSHandshakeErrors = compbasemetrics.NewCounter(
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&compbasemetrics.CounterOpts{
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Subsystem: APIServerComponent,
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Name: "tls_handshake_errors_total",
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Help: "Number of requests dropped with 'TLS handshake error from' error",
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StabilityLevel: compbasemetrics.ALPHA,
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},
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)
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WatchEvents = compbasemetrics.NewCounterVec(
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&compbasemetrics.CounterOpts{
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Subsystem: APIServerComponent,
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Name: "watch_events_total",
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Help: "Number of events sent in watch clients",
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StabilityLevel: compbasemetrics.ALPHA,
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},
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[]string{"group", "version", "kind"},
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)
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WatchEventsSizes = compbasemetrics.NewHistogramVec(
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&compbasemetrics.HistogramOpts{
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Subsystem: APIServerComponent,
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Name: "watch_events_sizes",
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Help: "Watch event size distribution in bytes",
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Buckets: compbasemetrics.ExponentialBuckets(1024, 2.0, 8), // 1K, 2K, 4K, 8K, ..., 128K.
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StabilityLevel: compbasemetrics.ALPHA,
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},
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[]string{"group", "version", "kind"},
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)
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// Because of volatility of the base metric this is pre-aggregated one. Instead of reporting current usage all the time
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// it reports maximal usage during the last second.
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currentInflightRequests = compbasemetrics.NewGaugeVec(
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&compbasemetrics.GaugeOpts{
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Subsystem: APIServerComponent,
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Name: "current_inflight_requests",
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Help: "Maximal number of currently used inflight request limit of this apiserver per request kind in last second.",
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StabilityLevel: compbasemetrics.STABLE,
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},
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[]string{"request_kind"},
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)
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currentInqueueRequests = compbasemetrics.NewGaugeVec(
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&compbasemetrics.GaugeOpts{
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Subsystem: APIServerComponent,
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Name: "current_inqueue_requests",
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Help: "Maximal number of queued requests in this apiserver per request kind in last second.",
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StabilityLevel: compbasemetrics.ALPHA,
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},
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[]string{"request_kind"},
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)
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requestTerminationsTotal = compbasemetrics.NewCounterVec(
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&compbasemetrics.CounterOpts{
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Subsystem: APIServerComponent,
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Name: "request_terminations_total",
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Help: "Number of requests which apiserver terminated in self-defense.",
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StabilityLevel: compbasemetrics.ALPHA,
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},
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[]string{"verb", "group", "version", "resource", "subresource", "scope", "component", "code"},
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)
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apiSelfRequestCounter = compbasemetrics.NewCounterVec(
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&compbasemetrics.CounterOpts{
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Subsystem: APIServerComponent,
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Name: "selfrequest_total",
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Help: "Counter of apiserver self-requests broken out for each verb, API resource and subresource.",
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StabilityLevel: compbasemetrics.ALPHA,
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},
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[]string{"verb", "resource", "subresource"},
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)
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requestFilterDuration = compbasemetrics.NewHistogramVec(
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&compbasemetrics.HistogramOpts{
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Subsystem: APIServerComponent,
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Name: "request_filter_duration_seconds",
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Help: "Request filter latency distribution in seconds, for each filter type",
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Buckets: []float64{0.0001, 0.0003, 0.001, 0.003, 0.01, 0.03, 0.1, 0.3, 1.0, 5.0},
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StabilityLevel: compbasemetrics.ALPHA,
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},
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[]string{"filter"},
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)
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// requestAbortsTotal is a number of aborted requests with http.ErrAbortHandler
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requestAbortsTotal = compbasemetrics.NewCounterVec(
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&compbasemetrics.CounterOpts{
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Subsystem: APIServerComponent,
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Name: "request_aborts_total",
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Help: "Number of requests which apiserver aborted possibly due to a timeout, for each group, version, verb, resource, subresource and scope",
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StabilityLevel: compbasemetrics.ALPHA,
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},
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[]string{"verb", "group", "version", "resource", "subresource", "scope"},
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)
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// requestPostTimeoutTotal tracks the activity of the executing request handler after the associated request
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// has been timed out by the apiserver.
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// source: the name of the handler that is recording this metric. Currently, we have two:
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// - timeout-handler: the "executing" handler returns after the timeout filter times out the request.
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// - rest-handler: the "executing" handler returns after the rest layer times out the request.
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// status: whether the handler panicked or threw an error, possible values:
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// - 'panic': the handler panicked
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// - 'error': the handler return an error
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// - 'ok': the handler returned a result (no error and no panic)
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// - 'pending': the handler is still running in the background and it did not return
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// within the wait threshold.
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requestPostTimeoutTotal = compbasemetrics.NewCounterVec(
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&compbasemetrics.CounterOpts{
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Subsystem: APIServerComponent,
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Name: "request_post_timeout_total",
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Help: "Tracks the activity of the request handlers after the associated requests have been timed out by the apiserver",
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StabilityLevel: compbasemetrics.ALPHA,
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},
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[]string{"source", "status"},
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)
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requestTimestampComparisonDuration = compbasemetrics.NewHistogramVec(
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&compbasemetrics.HistogramOpts{
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Subsystem: APIServerComponent,
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Name: "request_timestamp_comparison_time",
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Help: "Time taken for comparison of old vs new objects in UPDATE or PATCH requests",
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Buckets: []float64{0.0001, 0.0003, 0.001, 0.003, 0.01, 0.03, 0.1, 0.3, 1.0, 5.0},
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StabilityLevel: compbasemetrics.ALPHA,
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},
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// Path the code takes to reach a conclusion:
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// i.e. unequalObjectsFast, unequalObjectsSlow, equalObjectsSlow
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[]string{"code_path"},
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)
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metrics = []resettableCollector{
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deprecatedRequestGauge,
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requestCounter,
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longRunningRequestsGauge,
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requestLatencies,
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requestSloLatencies,
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requestSliLatencies,
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fieldValidationRequestLatencies,
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responseSizes,
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TLSHandshakeErrors,
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WatchEvents,
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WatchEventsSizes,
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currentInflightRequests,
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currentInqueueRequests,
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requestTerminationsTotal,
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apiSelfRequestCounter,
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requestFilterDuration,
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requestAbortsTotal,
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requestPostTimeoutTotal,
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requestTimestampComparisonDuration,
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}
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// these are the valid request methods which we report in our metrics. Any other request methods
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// will be aggregated under 'unknown'
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validRequestMethods = utilsets.NewString(
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"APPLY",
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"CONNECT",
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"CREATE",
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"DELETE",
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"DELETECOLLECTION",
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"GET",
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"LIST",
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"PATCH",
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"POST",
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"PROXY",
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"PUT",
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"UPDATE",
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"WATCH",
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"WATCHLIST")
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// These are the valid connect requests which we report in our metrics.
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validConnectRequests = utilsets.NewString(
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"log",
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"exec",
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"portforward",
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"attach",
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"proxy")
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)
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const (
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// ReadOnlyKind is a string identifying read only request kind
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ReadOnlyKind = "readOnly"
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// MutatingKind is a string identifying mutating request kind
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MutatingKind = "mutating"
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// WaitingPhase is the phase value for a request waiting in a queue
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WaitingPhase = "waiting"
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// ExecutingPhase is the phase value for an executing request
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ExecutingPhase = "executing"
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)
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const (
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// deprecatedAnnotationKey is a key for an audit annotation set to
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// "true" on requests made to deprecated API versions
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deprecatedAnnotationKey = "k8s.io/deprecated"
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// removedReleaseAnnotationKey is a key for an audit annotation set to
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// the target removal release, in "<major>.<minor>" format,
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// on requests made to deprecated API versions with a target removal release
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removedReleaseAnnotationKey = "k8s.io/removed-release"
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)
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const (
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// The source that is recording the apiserver_request_post_timeout_total metric.
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// The "executing" request handler returns after the timeout filter times out the request.
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PostTimeoutSourceTimeoutHandler = "timeout-handler"
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// The source that is recording the apiserver_request_post_timeout_total metric.
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// The "executing" request handler returns after the rest layer times out the request.
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PostTimeoutSourceRestHandler = "rest-handler"
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)
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const (
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// The executing request handler panicked after the request had
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// been timed out by the apiserver.
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PostTimeoutHandlerPanic = "panic"
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// The executing request handler has returned an error to the post-timeout
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// receiver after the request had been timed out by the apiserver.
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PostTimeoutHandlerError = "error"
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// The executing request handler has returned a result to the post-timeout
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// receiver after the request had been timed out by the apiserver.
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PostTimeoutHandlerOK = "ok"
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// The executing request handler has not panicked or returned any error/result to
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// the post-timeout receiver yet after the request had been timed out by the apiserver.
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// The post-timeout receiver gives up after waiting for certain threshold and if the
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// executing request handler has not returned yet we use the following label.
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PostTimeoutHandlerPending = "pending"
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)
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var registerMetrics sync.Once
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// Register all metrics.
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func Register() {
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registerMetrics.Do(func() {
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for _, metric := range metrics {
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legacyregistry.MustRegister(metric)
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}
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})
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}
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// Reset all metrics.
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func Reset() {
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for _, metric := range metrics {
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metric.Reset()
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}
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}
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// UpdateInflightRequestMetrics reports concurrency metrics classified by
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// mutating vs Readonly.
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func UpdateInflightRequestMetrics(phase string, nonmutating, mutating int) {
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for _, kc := range []struct {
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kind string
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count int
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}{{ReadOnlyKind, nonmutating}, {MutatingKind, mutating}} {
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if phase == ExecutingPhase {
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currentInflightRequests.WithLabelValues(kc.kind).Set(float64(kc.count))
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} else {
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currentInqueueRequests.WithLabelValues(kc.kind).Set(float64(kc.count))
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}
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}
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}
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func RecordFilterLatency(ctx context.Context, name string, elapsed time.Duration) {
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requestFilterDuration.WithContext(ctx).WithLabelValues(name).Observe(elapsed.Seconds())
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}
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func RecordTimestampComparisonLatency(codePath string, elapsed time.Duration) {
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requestTimestampComparisonDuration.WithLabelValues(codePath).Observe(elapsed.Seconds())
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}
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func RecordRequestPostTimeout(source string, status string) {
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requestPostTimeoutTotal.WithLabelValues(source, status).Inc()
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}
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// RecordRequestAbort records that the request was aborted possibly due to a timeout.
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func RecordRequestAbort(req *http.Request, requestInfo *request.RequestInfo) {
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if requestInfo == nil {
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requestInfo = &request.RequestInfo{Verb: req.Method, Path: req.URL.Path}
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}
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scope := CleanScope(requestInfo)
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reportedVerb := cleanVerb(CanonicalVerb(strings.ToUpper(req.Method), scope), "", req, requestInfo)
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resource := requestInfo.Resource
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subresource := requestInfo.Subresource
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group := requestInfo.APIGroup
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version := requestInfo.APIVersion
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requestAbortsTotal.WithContext(req.Context()).WithLabelValues(reportedVerb, group, version, resource, subresource, scope).Inc()
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}
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// RecordDroppedRequest records that the request was rejected via http.TooManyRequests.
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func RecordDroppedRequest(req *http.Request, requestInfo *request.RequestInfo, component string, isMutatingRequest bool) {
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if requestInfo == nil {
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requestInfo = &request.RequestInfo{Verb: req.Method, Path: req.URL.Path}
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}
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scope := CleanScope(requestInfo)
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dryRun := cleanDryRun(req.URL)
|
|
|
|
// We don't use verb from <requestInfo>, as this may be propagated from
|
|
// InstrumentRouteFunc which is registered in installer.go with predefined
|
|
// list of verbs (different than those translated to RequestInfo).
|
|
// However, we need to tweak it e.g. to differentiate GET from LIST.
|
|
reportedVerb := cleanVerb(CanonicalVerb(strings.ToUpper(req.Method), scope), "", req, requestInfo)
|
|
|
|
if requestInfo.IsResourceRequest {
|
|
requestCounter.WithContext(req.Context()).WithLabelValues(reportedVerb, dryRun, requestInfo.APIGroup, requestInfo.APIVersion, requestInfo.Resource, requestInfo.Subresource, scope, component, codeToString(http.StatusTooManyRequests)).Inc()
|
|
} else {
|
|
requestCounter.WithContext(req.Context()).WithLabelValues(reportedVerb, dryRun, "", "", "", requestInfo.Subresource, scope, component, codeToString(http.StatusTooManyRequests)).Inc()
|
|
}
|
|
}
|
|
|
|
// RecordRequestTermination records that the request was terminated early as part of a resource
|
|
// preservation or apiserver self-defense mechanism (e.g. timeouts, maxinflight throttling,
|
|
// proxyHandler errors). RecordRequestTermination should only be called zero or one times
|
|
// per request.
|
|
func RecordRequestTermination(req *http.Request, requestInfo *request.RequestInfo, component string, code int) {
|
|
if requestInfo == nil {
|
|
requestInfo = &request.RequestInfo{Verb: req.Method, Path: req.URL.Path}
|
|
}
|
|
scope := CleanScope(requestInfo)
|
|
|
|
// We don't use verb from <requestInfo>, as this may be propagated from
|
|
// InstrumentRouteFunc which is registered in installer.go with predefined
|
|
// list of verbs (different than those translated to RequestInfo).
|
|
// However, we need to tweak it e.g. to differentiate GET from LIST.
|
|
reportedVerb := cleanVerb(CanonicalVerb(strings.ToUpper(req.Method), scope), "", req, requestInfo)
|
|
|
|
if requestInfo.IsResourceRequest {
|
|
requestTerminationsTotal.WithContext(req.Context()).WithLabelValues(reportedVerb, requestInfo.APIGroup, requestInfo.APIVersion, requestInfo.Resource, requestInfo.Subresource, scope, component, codeToString(code)).Inc()
|
|
} else {
|
|
requestTerminationsTotal.WithContext(req.Context()).WithLabelValues(reportedVerb, "", "", "", requestInfo.Path, scope, component, codeToString(code)).Inc()
|
|
}
|
|
}
|
|
|
|
// RecordLongRunning tracks the execution of a long running request against the API server. It provides an accurate count
|
|
// of the total number of open long running requests. requestInfo may be nil if the caller is not in the normal request flow.
|
|
func RecordLongRunning(req *http.Request, requestInfo *request.RequestInfo, component string, fn func()) {
|
|
if requestInfo == nil {
|
|
requestInfo = &request.RequestInfo{Verb: req.Method, Path: req.URL.Path}
|
|
}
|
|
var g compbasemetrics.GaugeMetric
|
|
scope := CleanScope(requestInfo)
|
|
|
|
// We don't use verb from <requestInfo>, as this may be propagated from
|
|
// InstrumentRouteFunc which is registered in installer.go with predefined
|
|
// list of verbs (different than those translated to RequestInfo).
|
|
// However, we need to tweak it e.g. to differentiate GET from LIST.
|
|
reportedVerb := cleanVerb(CanonicalVerb(strings.ToUpper(req.Method), scope), "", req, requestInfo)
|
|
|
|
if requestInfo.IsResourceRequest {
|
|
g = longRunningRequestsGauge.WithContext(req.Context()).WithLabelValues(reportedVerb, requestInfo.APIGroup, requestInfo.APIVersion, requestInfo.Resource, requestInfo.Subresource, scope, component)
|
|
} else {
|
|
g = longRunningRequestsGauge.WithContext(req.Context()).WithLabelValues(reportedVerb, "", "", "", requestInfo.Path, scope, component)
|
|
}
|
|
g.Inc()
|
|
defer g.Dec()
|
|
fn()
|
|
}
|
|
|
|
// MonitorRequest handles standard transformations for client and the reported verb and then invokes Monitor to record
|
|
// a request. verb must be uppercase to be backwards compatible with existing monitoring tooling.
|
|
func MonitorRequest(req *http.Request, verb, group, version, resource, subresource, scope, component string, deprecated bool, removedRelease string, httpCode, respSize int, elapsed time.Duration) {
|
|
requestInfo, ok := request.RequestInfoFrom(req.Context())
|
|
if !ok || requestInfo == nil {
|
|
requestInfo = &request.RequestInfo{Verb: req.Method, Path: req.URL.Path}
|
|
}
|
|
// We don't use verb from <requestInfo>, as this may be propagated from
|
|
// InstrumentRouteFunc which is registered in installer.go with predefined
|
|
// list of verbs (different than those translated to RequestInfo).
|
|
// However, we need to tweak it e.g. to differentiate GET from LIST.
|
|
reportedVerb := cleanVerb(CanonicalVerb(strings.ToUpper(req.Method), scope), verb, req, requestInfo)
|
|
|
|
dryRun := cleanDryRun(req.URL)
|
|
elapsedSeconds := elapsed.Seconds()
|
|
requestCounter.WithContext(req.Context()).WithLabelValues(reportedVerb, dryRun, group, version, resource, subresource, scope, component, codeToString(httpCode)).Inc()
|
|
// MonitorRequest happens after authentication, so we can trust the username given by the request
|
|
info, ok := request.UserFrom(req.Context())
|
|
if ok && info.GetName() == user.APIServerUser {
|
|
apiSelfRequestCounter.WithContext(req.Context()).WithLabelValues(reportedVerb, resource, subresource).Inc()
|
|
}
|
|
if deprecated {
|
|
deprecatedRequestGauge.WithContext(req.Context()).WithLabelValues(group, version, resource, subresource, removedRelease).Set(1)
|
|
audit.AddAuditAnnotation(req.Context(), deprecatedAnnotationKey, "true")
|
|
if len(removedRelease) > 0 {
|
|
audit.AddAuditAnnotation(req.Context(), removedReleaseAnnotationKey, removedRelease)
|
|
}
|
|
}
|
|
requestLatencies.WithContext(req.Context()).WithLabelValues(reportedVerb, dryRun, group, version, resource, subresource, scope, component).Observe(elapsedSeconds)
|
|
fieldValidation := cleanFieldValidation(req.URL)
|
|
fieldValidationRequestLatencies.WithContext(req.Context()).WithLabelValues(fieldValidation)
|
|
|
|
if wd, ok := request.LatencyTrackersFrom(req.Context()); ok {
|
|
sliLatency := elapsedSeconds - (wd.MutatingWebhookTracker.GetLatency() + wd.ValidatingWebhookTracker.GetLatency() + wd.APFQueueWaitTracker.GetLatency()).Seconds()
|
|
requestSloLatencies.WithContext(req.Context()).WithLabelValues(reportedVerb, group, version, resource, subresource, scope, component).Observe(sliLatency)
|
|
requestSliLatencies.WithContext(req.Context()).WithLabelValues(reportedVerb, group, version, resource, subresource, scope, component).Observe(sliLatency)
|
|
}
|
|
// We are only interested in response sizes of read requests.
|
|
if verb == "GET" || verb == "LIST" {
|
|
responseSizes.WithContext(req.Context()).WithLabelValues(reportedVerb, group, version, resource, subresource, scope, component).Observe(float64(respSize))
|
|
}
|
|
}
|
|
|
|
// InstrumentRouteFunc works like Prometheus' InstrumentHandlerFunc but wraps
|
|
// the go-restful RouteFunction instead of a HandlerFunc plus some Kubernetes endpoint specific information.
|
|
func InstrumentRouteFunc(verb, group, version, resource, subresource, scope, component string, deprecated bool, removedRelease string, routeFunc restful.RouteFunction) restful.RouteFunction {
|
|
return restful.RouteFunction(func(req *restful.Request, response *restful.Response) {
|
|
requestReceivedTimestamp, ok := request.ReceivedTimestampFrom(req.Request.Context())
|
|
if !ok {
|
|
requestReceivedTimestamp = time.Now()
|
|
}
|
|
|
|
delegate := &ResponseWriterDelegator{ResponseWriter: response.ResponseWriter}
|
|
|
|
rw := responsewriter.WrapForHTTP1Or2(delegate)
|
|
response.ResponseWriter = rw
|
|
|
|
routeFunc(req, response)
|
|
|
|
MonitorRequest(req.Request, verb, group, version, resource, subresource, scope, component, deprecated, removedRelease, delegate.Status(), delegate.ContentLength(), time.Since(requestReceivedTimestamp))
|
|
})
|
|
}
|
|
|
|
// InstrumentHandlerFunc works like Prometheus' InstrumentHandlerFunc but adds some Kubernetes endpoint specific information.
|
|
func InstrumentHandlerFunc(verb, group, version, resource, subresource, scope, component string, deprecated bool, removedRelease string, handler http.HandlerFunc) http.HandlerFunc {
|
|
return func(w http.ResponseWriter, req *http.Request) {
|
|
requestReceivedTimestamp, ok := request.ReceivedTimestampFrom(req.Context())
|
|
if !ok {
|
|
requestReceivedTimestamp = time.Now()
|
|
}
|
|
|
|
delegate := &ResponseWriterDelegator{ResponseWriter: w}
|
|
w = responsewriter.WrapForHTTP1Or2(delegate)
|
|
|
|
handler(w, req)
|
|
|
|
MonitorRequest(req, verb, group, version, resource, subresource, scope, component, deprecated, removedRelease, delegate.Status(), delegate.ContentLength(), time.Since(requestReceivedTimestamp))
|
|
}
|
|
}
|
|
|
|
// NormalizedVerb returns normalized verb
|
|
func NormalizedVerb(req *http.Request) string {
|
|
verb := req.Method
|
|
requestInfo, ok := request.RequestInfoFrom(req.Context())
|
|
if ok {
|
|
// If we can find a requestInfo, we can get a scope, and then
|
|
// we can convert GETs to LISTs when needed.
|
|
scope := CleanScope(requestInfo)
|
|
verb = CanonicalVerb(strings.ToUpper(verb), scope)
|
|
}
|
|
|
|
// mark APPLY requests, WATCH requests and CONNECT requests correctly.
|
|
return CleanVerb(verb, req, requestInfo)
|
|
}
|
|
|
|
// CleanScope returns the scope of the request.
|
|
func CleanScope(requestInfo *request.RequestInfo) string {
|
|
if requestInfo.Name != "" || requestInfo.Verb == "create" {
|
|
return "resource"
|
|
}
|
|
if requestInfo.Namespace != "" {
|
|
return "namespace"
|
|
}
|
|
if requestInfo.IsResourceRequest {
|
|
return "cluster"
|
|
}
|
|
// this is the empty scope
|
|
return ""
|
|
}
|
|
|
|
// CanonicalVerb distinguishes LISTs from GETs (and HEADs). It assumes verb is
|
|
// UPPERCASE.
|
|
func CanonicalVerb(verb string, scope string) string {
|
|
switch verb {
|
|
case "GET", "HEAD":
|
|
if scope != "resource" && scope != "" {
|
|
return "LIST"
|
|
}
|
|
return "GET"
|
|
default:
|
|
return verb
|
|
}
|
|
}
|
|
|
|
// CleanVerb returns a normalized verb, so that it is easy to tell WATCH from
|
|
// LIST, APPLY from PATCH and CONNECT from others.
|
|
func CleanVerb(verb string, request *http.Request, requestInfo *request.RequestInfo) string {
|
|
reportedVerb := verb
|
|
if suggestedVerb := getVerbIfWatch(request); suggestedVerb == "WATCH" {
|
|
reportedVerb = "WATCH"
|
|
}
|
|
// normalize the legacy WATCHLIST to WATCH to ensure users aren't surprised by metrics
|
|
if verb == "WATCHLIST" {
|
|
reportedVerb = "WATCH"
|
|
}
|
|
if verb == "PATCH" && request.Header.Get("Content-Type") == string(types.ApplyPatchType) {
|
|
reportedVerb = "APPLY"
|
|
}
|
|
if requestInfo != nil && requestInfo.IsResourceRequest && len(requestInfo.Subresource) > 0 && validConnectRequests.Has(requestInfo.Subresource) {
|
|
reportedVerb = "CONNECT"
|
|
}
|
|
return reportedVerb
|
|
}
|
|
|
|
// cleanVerb additionally ensures that unknown verbs don't clog up the metrics.
|
|
func cleanVerb(verb, suggestedVerb string, request *http.Request, requestInfo *request.RequestInfo) string {
|
|
// CanonicalVerb (being an input for this function) doesn't handle correctly the
|
|
// deprecated path pattern for watch of:
|
|
// GET /api/{version}/watch/{resource}
|
|
// We correct it manually based on the pass verb from the installer.
|
|
if suggestedVerb == "WATCH" || suggestedVerb == "WATCHLIST" {
|
|
return "WATCH"
|
|
}
|
|
reportedVerb := CleanVerb(verb, request, requestInfo)
|
|
if validRequestMethods.Has(reportedVerb) {
|
|
return reportedVerb
|
|
}
|
|
return OtherRequestMethod
|
|
}
|
|
|
|
// getVerbIfWatch additionally ensures that GET or List would be transformed to WATCH
|
|
func getVerbIfWatch(req *http.Request) string {
|
|
if strings.ToUpper(req.Method) == "GET" || strings.ToUpper(req.Method) == "LIST" {
|
|
// see apimachinery/pkg/runtime/conversion.go Convert_Slice_string_To_bool
|
|
if values := req.URL.Query()["watch"]; len(values) > 0 {
|
|
if value := strings.ToLower(values[0]); value != "0" && value != "false" {
|
|
return "WATCH"
|
|
}
|
|
}
|
|
}
|
|
return ""
|
|
}
|
|
|
|
func cleanDryRun(u *url.URL) string {
|
|
// avoid allocating when we don't see dryRun in the query
|
|
if !strings.Contains(u.RawQuery, "dryRun") {
|
|
return ""
|
|
}
|
|
dryRun := u.Query()["dryRun"]
|
|
if errs := validation.ValidateDryRun(nil, dryRun); len(errs) > 0 {
|
|
return "invalid"
|
|
}
|
|
// Since dryRun could be valid with any arbitrarily long length
|
|
// we have to dedup and sort the elements before joining them together
|
|
// TODO: this is a fairly large allocation for what it does, consider
|
|
// a sort and dedup in a single pass
|
|
return strings.Join(utilsets.NewString(dryRun...).List(), ",")
|
|
}
|
|
|
|
func cleanFieldValidation(u *url.URL) string {
|
|
// avoid allocating when we don't see dryRun in the query
|
|
if !strings.Contains(u.RawQuery, "fieldValidation") {
|
|
return ""
|
|
}
|
|
fieldValidation := u.Query()["fieldValidation"]
|
|
if len(fieldValidation) != 1 {
|
|
return "invalid"
|
|
}
|
|
if errs := validation.ValidateFieldValidation(nil, fieldValidation[0]); len(errs) > 0 {
|
|
return "invalid"
|
|
}
|
|
return fieldValidation[0]
|
|
}
|
|
|
|
var _ http.ResponseWriter = (*ResponseWriterDelegator)(nil)
|
|
var _ responsewriter.UserProvidedDecorator = (*ResponseWriterDelegator)(nil)
|
|
|
|
// ResponseWriterDelegator interface wraps http.ResponseWriter to additionally record content-length, status-code, etc.
|
|
type ResponseWriterDelegator struct {
|
|
http.ResponseWriter
|
|
|
|
status int
|
|
written int64
|
|
wroteHeader bool
|
|
}
|
|
|
|
func (r *ResponseWriterDelegator) Unwrap() http.ResponseWriter {
|
|
return r.ResponseWriter
|
|
}
|
|
|
|
func (r *ResponseWriterDelegator) WriteHeader(code int) {
|
|
r.status = code
|
|
r.wroteHeader = true
|
|
r.ResponseWriter.WriteHeader(code)
|
|
}
|
|
|
|
func (r *ResponseWriterDelegator) Write(b []byte) (int, error) {
|
|
if !r.wroteHeader {
|
|
r.WriteHeader(http.StatusOK)
|
|
}
|
|
n, err := r.ResponseWriter.Write(b)
|
|
r.written += int64(n)
|
|
return n, err
|
|
}
|
|
|
|
func (r *ResponseWriterDelegator) Status() int {
|
|
return r.status
|
|
}
|
|
|
|
func (r *ResponseWriterDelegator) ContentLength() int {
|
|
return int(r.written)
|
|
}
|
|
|
|
// Small optimization over Itoa
|
|
func codeToString(s int) string {
|
|
switch s {
|
|
case 100:
|
|
return "100"
|
|
case 101:
|
|
return "101"
|
|
|
|
case 200:
|
|
return "200"
|
|
case 201:
|
|
return "201"
|
|
case 202:
|
|
return "202"
|
|
case 203:
|
|
return "203"
|
|
case 204:
|
|
return "204"
|
|
case 205:
|
|
return "205"
|
|
case 206:
|
|
return "206"
|
|
|
|
case 300:
|
|
return "300"
|
|
case 301:
|
|
return "301"
|
|
case 302:
|
|
return "302"
|
|
case 304:
|
|
return "304"
|
|
case 305:
|
|
return "305"
|
|
case 307:
|
|
return "307"
|
|
|
|
case 400:
|
|
return "400"
|
|
case 401:
|
|
return "401"
|
|
case 402:
|
|
return "402"
|
|
case 403:
|
|
return "403"
|
|
case 404:
|
|
return "404"
|
|
case 405:
|
|
return "405"
|
|
case 406:
|
|
return "406"
|
|
case 407:
|
|
return "407"
|
|
case 408:
|
|
return "408"
|
|
case 409:
|
|
return "409"
|
|
case 410:
|
|
return "410"
|
|
case 411:
|
|
return "411"
|
|
case 412:
|
|
return "412"
|
|
case 413:
|
|
return "413"
|
|
case 414:
|
|
return "414"
|
|
case 415:
|
|
return "415"
|
|
case 416:
|
|
return "416"
|
|
case 417:
|
|
return "417"
|
|
case 418:
|
|
return "418"
|
|
|
|
case 500:
|
|
return "500"
|
|
case 501:
|
|
return "501"
|
|
case 502:
|
|
return "502"
|
|
case 503:
|
|
return "503"
|
|
case 504:
|
|
return "504"
|
|
case 505:
|
|
return "505"
|
|
|
|
case 428:
|
|
return "428"
|
|
case 429:
|
|
return "429"
|
|
case 431:
|
|
return "431"
|
|
case 511:
|
|
return "511"
|
|
|
|
default:
|
|
return strconv.Itoa(s)
|
|
}
|
|
}
|