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// Copyright 2022 The Prometheus 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.
//go:build !nostat
// +build !nostat
package collector
import (
"fmt"
"log/slog"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/procfs"
)
const cgroupsCollectorSubsystem = "cgroups"
type cgroupSummaryCollector struct {
fs procfs.FS
cgroups *prometheus.Desc
enabled *prometheus.Desc
logger *slog.Logger
}
func init() {
registerCollector(cgroupsCollectorSubsystem, defaultDisabled, NewCgroupSummaryCollector)
}
// NewCgroupSummaryCollector returns a new Collector exposing a summary of cgroups.
func NewCgroupSummaryCollector(logger *slog.Logger) (Collector, error) {
fs, err := procfs.NewFS(*procPath)
if err != nil {
return nil, fmt.Errorf("failed to open procfs: %w", err)
}
return &cgroupSummaryCollector{
fs: fs,
cgroups: prometheus.NewDesc(
prometheus.BuildFQName(namespace, cgroupsCollectorSubsystem, "cgroups"),
"Current cgroup number of the subsystem.",
[]string{"subsys_name"}, nil,
),
enabled: prometheus.NewDesc(
prometheus.BuildFQName(namespace, cgroupsCollectorSubsystem, "enabled"),
"Current cgroup number of the subsystem.",
[]string{"subsys_name"}, nil,
),
logger: logger,
}, nil
}
// Update implements Collector and exposes cgroup statistics.
func (c *cgroupSummaryCollector) Update(ch chan<- prometheus.Metric) error {
cgroupSummarys, err := c.fs.CgroupSummarys()
if err != nil {
return err
}
for _, cs := range cgroupSummarys {
ch <- prometheus.MustNewConstMetric(c.cgroups, prometheus.GaugeValue, float64(cs.Cgroups), cs.SubsysName)
ch <- prometheus.MustNewConstMetric(c.enabled, prometheus.GaugeValue, float64(cs.Enabled), cs.SubsysName)
}
return nil
}
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