/
metrics.go
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/
metrics.go
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/*
Copyright 2021 Maximilian Geberl.
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 metrics is a prometheus exporter for kubeteach
package metrics
import (
"context"
"errors"
kubeteachv1alpha1 "github.com/dergeberl/kubeteach/api/v1alpha1"
"github.com/dergeberl/kubeteach/controllers"
"github.com/go-logr/logr"
"github.com/prometheus/client_golang/prometheus"
"sigs.k8s.io/controller-runtime/pkg/client"
)
const (
metricPrefix = "kubeteach"
)
// Exporter represents a prometheus exporter for kubeteach
type Exporter struct {
log logr.Logger
k8sClient client.Client
ExerciseSetPointsTotal *prometheus.Desc
ExerciseSetPointsAchieved *prometheus.Desc
ExerciseSetTasksWithoutPoints *prometheus.Desc
ExerciseSetTasks *prometheus.Desc
ExerciseSetActiveTasks *prometheus.Desc
ExerciseSetPendingTasks *prometheus.Desc
ExerciseSetSuccessfulTasks *prometheus.Desc
ExerciseSetUnknownTasks *prometheus.Desc
TaskState *prometheus.Desc
}
// New generate a new Exporter object
func New(k8sClient client.Client, log logr.Logger) *Exporter {
labels := []string{"name", "namespace"}
return &Exporter{
log: log,
k8sClient: k8sClient,
ExerciseSetPointsTotal: prometheus.NewDesc(
prometheus.BuildFQName(metricPrefix, "exerciseset", "points"),
"total points of exerciseset",
labels,
nil),
ExerciseSetPointsAchieved: prometheus.NewDesc(
prometheus.BuildFQName(metricPrefix, "exerciseset", "points_achieved"),
"achieved points of exerciseset",
labels,
nil),
ExerciseSetTasksWithoutPoints: prometheus.NewDesc(
prometheus.BuildFQName(metricPrefix, "exerciseset", "tasks_without_points"),
"task without points of exerciseset",
labels,
nil),
ExerciseSetTasks: prometheus.NewDesc(
prometheus.BuildFQName(metricPrefix, "exerciseset", "tasks"),
"total tasks of exerciseset",
labels,
nil),
ExerciseSetActiveTasks: prometheus.NewDesc(
prometheus.BuildFQName(metricPrefix, "exerciseset", "active_tasks"),
"active points of exerciseset",
labels,
nil),
ExerciseSetPendingTasks: prometheus.NewDesc(
prometheus.BuildFQName(metricPrefix, "exerciseset", "pending_tasks"),
"total pending of exerciseset",
labels,
nil),
ExerciseSetSuccessfulTasks: prometheus.NewDesc(
prometheus.BuildFQName(metricPrefix, "exerciseset", "successful_tasks"),
"successful points of exerciseset",
labels,
nil),
ExerciseSetUnknownTasks: prometheus.NewDesc(
prometheus.BuildFQName(metricPrefix, "exerciseset", "unknown_tasks"),
"unknown points of exerciseset",
labels,
nil),
TaskState: prometheus.NewDesc(
prometheus.BuildFQName(metricPrefix, "task", "state"),
"state of task (1 = successful, 2 = active, 3 = pending, 4 = unknown)",
labels,
nil),
}
}
// Describe describes metrics for kubeteach
func (e *Exporter) Describe(descs chan<- *prometheus.Desc) {
descs <- e.ExerciseSetPointsTotal
descs <- e.ExerciseSetPointsAchieved
descs <- e.ExerciseSetTasksWithoutPoints
descs <- e.ExerciseSetTasks
descs <- e.ExerciseSetActiveTasks
descs <- e.ExerciseSetPendingTasks
descs <- e.ExerciseSetSuccessfulTasks
descs <- e.ExerciseSetUnknownTasks
descs <- e.TaskState
}
// Collect collects metrics for kubeteach
func (e *Exporter) Collect(metrics chan<- prometheus.Metric) {
if e.k8sClient == nil {
e.log.Error(errors.New("no k8s client found"), "failed to get data from kubernetes")
return
}
err := e.collectExerciseSet(metrics)
if err != nil {
e.log.Error(err, "failed to get ExerciseSet metrics")
}
err = e.collectTask(metrics)
if err != nil {
e.log.Error(err, "failed to get task metrics")
}
}
func (e *Exporter) collectExerciseSet(metrics chan<- prometheus.Metric) error {
ctx := context.Background()
exerciseSetList := &kubeteachv1alpha1.ExerciseSetList{}
err := e.k8sClient.List(ctx, exerciseSetList)
if err != nil {
return err
}
for _, exerciseSet := range exerciseSetList.Items {
metrics <- prometheus.MustNewConstMetric(
e.ExerciseSetPointsTotal,
prometheus.GaugeValue,
float64(exerciseSet.Status.PointsTotal),
exerciseSet.Name, exerciseSet.Namespace,
)
metrics <- prometheus.MustNewConstMetric(
e.ExerciseSetPointsAchieved,
prometheus.GaugeValue,
float64(exerciseSet.Status.PointsAchieved),
exerciseSet.Name, exerciseSet.Namespace,
)
metrics <- prometheus.MustNewConstMetric(
e.ExerciseSetTasksWithoutPoints,
prometheus.GaugeValue,
float64(exerciseSet.Status.NumberOfTasksWithoutPoints),
exerciseSet.Name, exerciseSet.Namespace,
)
metrics <- prometheus.MustNewConstMetric(
e.ExerciseSetTasks,
prometheus.GaugeValue,
float64(exerciseSet.Status.NumberOfTasks),
exerciseSet.Name, exerciseSet.Namespace,
)
metrics <- prometheus.MustNewConstMetric(
e.ExerciseSetActiveTasks,
prometheus.GaugeValue,
float64(exerciseSet.Status.NumberOfActiveTasks),
exerciseSet.Name, exerciseSet.Namespace,
)
metrics <- prometheus.MustNewConstMetric(
e.ExerciseSetPendingTasks,
prometheus.GaugeValue,
float64(exerciseSet.Status.NumberOfPendingTasks),
exerciseSet.Name, exerciseSet.Namespace,
)
metrics <- prometheus.MustNewConstMetric(
e.ExerciseSetSuccessfulTasks,
prometheus.GaugeValue,
float64(exerciseSet.Status.NumberOfSuccessfulTasks),
exerciseSet.Name, exerciseSet.Namespace,
)
metrics <- prometheus.MustNewConstMetric(
e.ExerciseSetUnknownTasks,
prometheus.GaugeValue,
float64(exerciseSet.Status.NumberOfUnknownTasks),
exerciseSet.Name, exerciseSet.Namespace,
)
}
return nil
}
func (e *Exporter) collectTask(metrics chan<- prometheus.Metric) error {
ctx := context.Background()
taskList := &kubeteachv1alpha1.TaskList{}
err := e.k8sClient.List(ctx, taskList)
if err != nil {
return err
}
for _, task := range taskList.Items {
var state string
if task.Status.State != nil {
state = *task.Status.State
}
// 1 = successful
// 2 = active
// 3 = pending
// 4 = unknown
stateInt := 4
switch state {
case controllers.StateSuccessful:
stateInt = 1
case controllers.StateActive:
stateInt = 2
case controllers.StatePending:
stateInt = 3
}
metrics <- prometheus.MustNewConstMetric(
e.TaskState,
prometheus.GaugeValue,
float64(stateInt),
task.Name, task.Namespace,
)
}
return nil
}