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// Copyright 2019 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 !norapl
// +build !norapl
package collector
import (
"errors"
"fmt"
"log/slog"
"os"
"strconv"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/procfs/sysfs"
"gopkg.in/alecthomas/kingpin.v2"
)
const raplCollectorSubsystem = "rapl"
type raplCollector struct {
fs sysfs.FS
logger *slog.Logger
joulesMetricDesc *prometheus.Desc
}
func init() {
registerCollector(raplCollectorSubsystem, defaultEnabled, NewRaplCollector)
}
var (
raplZoneLabel = kingpin.Flag("collector.rapl.enable-zone-label", "Enables service unit metric unit_start_time_seconds").Bool()
)
// NewRaplCollector returns a new Collector exposing RAPL metrics.
func NewRaplCollector(logger *slog.Logger) (Collector, error) {
fs, err := sysfs.NewFS(*sysPath)
if err != nil {
return nil, err
}
joulesMetricDesc := prometheus.NewDesc(
prometheus.BuildFQName(namespace, raplCollectorSubsystem, "joules_total"),
"Current RAPL value in joules",
[]string{"index", "path", "rapl_zone"}, nil,
)
collector := raplCollector{
fs: fs,
logger: logger,
joulesMetricDesc: joulesMetricDesc,
}
return &collector, nil
}
// Update implements Collector and exposes RAPL related metrics.
func (c *raplCollector) Update(ch chan<- prometheus.Metric) error {
// nil zones are fine when platform doesn't have powercap files present.
zones, err := sysfs.GetRaplZones(c.fs)
if err != nil {
if errors.Is(err, os.ErrNotExist) {
c.logger.Debug("Platform doesn't have powercap files present", "err", err)
return ErrNoData
}
if errors.Is(err, os.ErrPermission) {
c.logger.Debug("Can't access powercap files", "err", err)
return ErrNoData
}
return fmt.Errorf("failed to retrieve rapl stats: %w", err)
}
for _, rz := range zones {
microJoules, err := rz.GetEnergyMicrojoules()
if err != nil {
if errors.Is(err, os.ErrPermission) {
c.logger.Debug("Can't access energy_uj file", "zone", rz, "err", err)
return ErrNoData
}
return err
}
joules := float64(microJoules) / 1000000.0
if *raplZoneLabel {
ch <- c.joulesMetricWithZoneLabel(rz, joules)
} else {
ch <- c.joulesMetric(rz, joules)
}
}
return nil
}
func (c *raplCollector) joulesMetric(z sysfs.RaplZone, v float64) prometheus.Metric {
index := strconv.Itoa(z.Index)
descriptor := prometheus.NewDesc(
prometheus.BuildFQName(
namespace,
raplCollectorSubsystem,
fmt.Sprintf("%s_joules_total", SanitizeMetricName(z.Name)),
),
fmt.Sprintf("Current RAPL %s value in joules", z.Name),
[]string{"index", "path"}, nil,
)
return prometheus.MustNewConstMetric(
descriptor,
prometheus.CounterValue,
v,
index,
z.Path,
)
}
func (c *raplCollector) joulesMetricWithZoneLabel(z sysfs.RaplZone, v float64) prometheus.Metric {
index := strconv.Itoa(z.Index)
return prometheus.MustNewConstMetric(
c.joulesMetricDesc,
prometheus.CounterValue,
v,
index,
z.Path,
z.Name,
)
}
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