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metrics: add internal copy of kube-state-metrics config types
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‎pkg/metrics/internal/config/config.go

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/*
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Copyright 2021 The Kubernetes Authors All rights reserved.
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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 config
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import (
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"fmt"
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)
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// Metrics is the top level configuration object.
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type Metrics struct {
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Spec MetricsSpec `yaml:"spec" json:"spec"`
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}
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// MetricsSpec is the configuration describing the custom resource state metrics to generate.
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type MetricsSpec struct {
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// Resources is the list of custom resources to be monitored. A resource with the same GroupVersionKind may appear
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// multiple times (e.g., to customize the namespace or subsystem,) but will incur additional overhead.
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Resources []Resource `yaml:"resources" json:"resources"`
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}
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// Resource configures a custom resource for metric generation.
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type Resource struct {
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// MetricNamePrefix defines a prefix for all metrics of the resource.
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// If set to "", no prefix will be added.
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// Example: If set to "foo", MetricNamePrefix will be "foo_<metric>".
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MetricNamePrefix *string `yaml:"metricNamePrefix" json:"metricNamePrefix"`
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// GroupVersionKind of the custom resource to be monitored.
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GroupVersionKind GroupVersionKind `yaml:"groupVersionKind" json:"groupVersionKind"`
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// Labels are added to all metrics. If the same key is used in a metric, the value from the metric will overwrite the value here.
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Labels `yaml:",inline" json:",inline"`
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// Metrics are the custom resource fields to be collected.
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Metrics []Generator `yaml:"metrics" json:"metrics"`
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// ErrorLogV defines the verbosity threshold for errors logged for this resource.
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ErrorLogV int32 `yaml:"errorLogV" json:"errorLogV"`
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// ResourcePlural sets the plural name of the resource. Defaults to the plural version of the Kind according to flect.Pluralize.
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ResourcePlural string `yaml:"resourcePlural" json:"resourcePlural"`
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}
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// GroupVersionKind is the Kubernetes group, version, and kind of a resource.
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type GroupVersionKind struct {
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Group string `yaml:"group" json:"group"`
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Version string `yaml:"version" json:"version"`
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Kind string `yaml:"kind" json:"kind"`
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}
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func (gvk GroupVersionKind) String() string {
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return fmt.Sprintf("%s_%s_%s", gvk.Group, gvk.Version, gvk.Kind)
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}
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// Labels is common configuration of labels to add to metrics.
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type Labels struct {
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// CommonLabels are added to all metrics.
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CommonLabels map[string]string `yaml:"commonLabels,omitempty" json:"commonLabels,omitempty"`
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// LabelsFromPath adds additional labels where the value is taken from a field in the resource.
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LabelsFromPath map[string][]string `yaml:"labelsFromPath,omitempty" json:"labelsFromPath,omitempty"`
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}
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// Generator describes a unique metric name.
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type Generator struct {
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// Name of the metric. Subject to prefixing based on the configuration of the Resource.
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Name string `yaml:"name" json:"name"`
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// Help text for the metric.
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Help string `yaml:"help" json:"help"`
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// Each targets a value or values from the resource.
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Each Metric `yaml:"each" json:"each"`
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// Labels are added to all metrics. Labels from Each will overwrite these if using the same key.
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Labels `yaml:",inline" json:",inline"` // json will inline because it is already tagged
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// ErrorLogV defines the verbosity threshold for errors logged for this metric. Must be non-zero to override the resource setting.
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ErrorLogV int32 `yaml:"errorLogV,omitempty" json:"errorLogV,omitempty"`
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}
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// Metric defines a metric to expose.
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// +union
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type Metric struct {
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// Type defines the type of the metric.
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// +unionDiscriminator
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Type MetricType `yaml:"type" json:"type"`
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// Gauge defines a gauge metric.
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// +optional
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Gauge *MetricGauge `yaml:"gauge,omitempty" json:"gauge,omitempty"`
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// StateSet defines a state set metric.
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// +optional
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StateSet *MetricStateSet `yaml:"stateSet,omitempty" json:"stateSet,omitempty"`
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// Info defines an info metric.
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// +optional
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Info *MetricInfo `yaml:"info,omitempty" json:"info,omitempty"`
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}
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// ConfigDecoder is for use with FromConfig.
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type ConfigDecoder interface {
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Decode(v interface{}) (err error)
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}

‎pkg/metrics/internal/config/config_metrics_types.go

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/*
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Copyright 2021 The Kubernetes Authors All rights reserved.
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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 config
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// MetricMeta are variables which may used for any metric type.
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type MetricMeta struct {
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// LabelsFromPath adds additional labels where the value of the label is taken from a field under Path.
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LabelsFromPath map[string][]string `yaml:"labelsFromPath,omitempty" json:"labelsFromPath,omitempty"`
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// Path is the path to to generate metric(s) for.
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Path []string `yaml:"path" json:"path"`
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}
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// MetricGauge targets a Path that may be a single value, array, or object. Arrays and objects will generate a metric per element.
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// Ref: https://github.com/OpenObservability/OpenMetrics/blob/main/specification/OpenMetrics.md#gauge
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type MetricGauge struct {
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MetricMeta `yaml:",inline" json:",inline"`
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// ValueFrom is the path to a numeric field under Path that will be the metric value.
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ValueFrom []string `yaml:"valueFrom" json:"valueFrom"`
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// LabelFromKey adds a label with the given name if Path is an object. The label value will be the object key.
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LabelFromKey string `yaml:"labelFromKey,omitempty" json:"labelFromKey,omitempty"`
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// NilIsZero indicates that if a value is nil it will be treated as zero value.
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NilIsZero bool `yaml:"nilIsZero" json:"nilIsZero"`
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}
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// MetricInfo is a metric which is used to expose textual information.
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// Ref: https://github.com/OpenObservability/OpenMetrics/blob/main/specification/OpenMetrics.md#info
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type MetricInfo struct {
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MetricMeta `yaml:",inline" json:",inline"`
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// LabelFromKey adds a label with the given name if Path is an object. The label value will be the object key.
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LabelFromKey string `yaml:"labelFromKey,omitempty" json:"labelFromKey,omitempty"`
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}
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// MetricStateSet is a metric which represent a series of related boolean values, also called a bitset.
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// Ref: https://github.com/OpenObservability/OpenMetrics/blob/main/specification/OpenMetrics.md#stateset
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type MetricStateSet struct {
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MetricMeta `yaml:",inline" json:",inline"`
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// List is the list of values to expose a value for.
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List []string `yaml:"list" json:"list"`
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// LabelName is the key of the label which is used for each entry in List to expose the value.
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LabelName string `yaml:"labelName" json:"labelName"`
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// ValueFrom is the subpath to compare the list to.
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ValueFrom []string `yaml:"valueFrom" json:"valueFrom"`
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}

‎pkg/metrics/internal/config/doc.go

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/*
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Copyright 2021 The Kubernetes Authors All rights reserved.
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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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// config contains a copy of the types from k8s.io/kube-state-metrics/pkg/customresourcestate.
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// The following modifications got applied:
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// For `config.go`:
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// * Rename the package to `config`.
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// * Drop `const customResourceState`.
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// * Drop all functions, only preserve structs.
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// * Use `int32` instead of `klog.Level`.
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// * Use `MetricType` instead of `metric.Type`
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// * Add `omitempty` to:
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// - `Labels.CommonLabels`
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// - `Labels.LabelsFromPath`
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// - `Generator.ErrorLogV`
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// - `Metric.Gauge`
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// - `Metric.StateSet`
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// - `Metric.Info`
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//
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// For `config_metrics_types.go`:
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// * Rename the package to `config`.
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// * Add `omitempty` to:
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// - `MetricMeta.LabelsFromPath
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// - `MetricGauge.LabelFromkey`
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// - `MetricInfo.LabelFromkey`
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package config
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// KubeStateMetricsVersion defines which version of kube-state-metrics these types
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// are based on and the output file should be compatible to.
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const KubeStateMetricsVersion = "v2.13.0"

‎pkg/metrics/internal/config/metric_types.go

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/*
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Copyright 2024 The Kubernetes Authors All rights reserved.
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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 config
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// MetricType is the type of a metric.
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type MetricType string
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// Supported metric types.
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const (
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MetricTypeGauge MetricType = "Gauge"
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MetricTypeStateSet MetricType = "StateSet"
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MetricTypeInfo MetricType = "Info"
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)

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