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111 lines
3.5 KiB
Go
111 lines
3.5 KiB
Go
/*
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Copyright 2017 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 audit
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import (
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"fmt"
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auditinternal "k8s.io/apiserver/pkg/apis/audit"
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"k8s.io/component-base/metrics"
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"k8s.io/component-base/metrics/legacyregistry"
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"k8s.io/klog"
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)
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const (
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subsystem = "apiserver_audit"
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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/20190404-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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eventCounter = metrics.NewCounter(
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&metrics.CounterOpts{
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Subsystem: subsystem,
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Name: "event_total",
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Help: "Counter of audit events generated and sent to the audit backend.",
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StabilityLevel: metrics.ALPHA,
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})
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errorCounter = metrics.NewCounterVec(
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&metrics.CounterOpts{
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Subsystem: subsystem,
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Name: "error_total",
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Help: "Counter of audit events that failed to be audited properly. " +
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"Plugin identifies the plugin affected by the error.",
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StabilityLevel: metrics.ALPHA,
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},
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[]string{"plugin"},
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)
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levelCounter = metrics.NewCounterVec(
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&metrics.CounterOpts{
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Subsystem: subsystem,
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Name: "level_total",
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Help: "Counter of policy levels for audit events (1 per request).",
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StabilityLevel: metrics.ALPHA,
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},
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[]string{"level"},
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)
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ApiserverAuditDroppedCounter = metrics.NewCounter(
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&metrics.CounterOpts{
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Subsystem: subsystem,
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Name: "requests_rejected_total",
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Help: "Counter of apiserver requests rejected due to an error " +
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"in audit logging backend.",
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StabilityLevel: metrics.ALPHA,
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},
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)
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)
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func init() {
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legacyregistry.MustRegister(eventCounter)
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legacyregistry.MustRegister(errorCounter)
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legacyregistry.MustRegister(levelCounter)
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legacyregistry.MustRegister(ApiserverAuditDroppedCounter)
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}
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// ObserveEvent updates the relevant prometheus metrics for the generated audit event.
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func ObserveEvent() {
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eventCounter.Inc()
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}
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// ObservePolicyLevel updates the relevant prometheus metrics with the audit level for a request.
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func ObservePolicyLevel(level auditinternal.Level) {
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levelCounter.WithLabelValues(string(level)).Inc()
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}
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// HandlePluginError handles an error that occurred in an audit plugin. This method should only be
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// used if the error may have prevented the audit event from being properly recorded. The events are
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// logged to the debug log.
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func HandlePluginError(plugin string, err error, impacted ...*auditinternal.Event) {
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// Count the error.
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errorCounter.WithLabelValues(plugin).Add(float64(len(impacted)))
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// Log the audit events to the debug log.
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msg := fmt.Sprintf("Error in audit plugin '%s' affecting %d audit events: %v\nImpacted events:\n",
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plugin, len(impacted), err)
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for _, ev := range impacted {
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msg = msg + EventString(ev) + "\n"
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}
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klog.Error(msg)
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}
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