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forked from prometheus-operator/prometheus-operator
/
collector.go
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/
collector.go
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// Copyright 2016 The prometheus-operator 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 prometheus
import (
"github.com/coreos/prometheus-operator/pkg/apis/monitoring/v1"
"github.com/prometheus/client_golang/prometheus"
"k8s.io/client-go/tools/cache"
)
var (
descPrometheusSpecReplicas = prometheus.NewDesc(
"prometheus_operator_spec_replicas",
"Number of expected replicas for the object.",
[]string{
"namespace",
"name",
}, nil,
)
)
type prometheusCollector struct {
store cache.Store
}
func NewPrometheusCollector(s cache.Store) *prometheusCollector {
return &prometheusCollector{store: s}
}
// Describe implements the prometheus.Collector interface.
func (c *prometheusCollector) Describe(ch chan<- *prometheus.Desc) {
ch <- descPrometheusSpecReplicas
}
// Collect implements the prometheus.Collector interface.
func (c *prometheusCollector) Collect(ch chan<- prometheus.Metric) {
for _, p := range c.store.List() {
c.collectPrometheus(ch, p.(*v1.Prometheus))
}
}
func (c *prometheusCollector) collectPrometheus(ch chan<- prometheus.Metric, p *v1.Prometheus) {
replicas := float64(minReplicas)
if p.Spec.Replicas != nil {
replicas = float64(*p.Spec.Replicas)
}
ch <- prometheus.MustNewConstMetric(descPrometheusSpecReplicas, prometheus.GaugeValue, replicas, p.Namespace, p.Name)
}