node_exporter/collector/softnet_linux.go

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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 !nosoftnet
// +build !nosoftnet
package collector
import (
"fmt"
"log/slog"
"strconv"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/procfs"
)
type softnetCollector struct {
fs procfs.FS
processed *prometheus.Desc
dropped *prometheus.Desc
timeSqueezed *prometheus.Desc
cpuCollision *prometheus.Desc
receivedRps *prometheus.Desc
flowLimitCount *prometheus.Desc
softnetBacklogLen *prometheus.Desc
logger *slog.Logger
}
const (
softnetSubsystem = "softnet"
)
func init() {
registerCollector("softnet", defaultEnabled, NewSoftnetCollector)
}
// NewSoftnetCollector returns a new Collector exposing softnet metrics.
func NewSoftnetCollector(logger *slog.Logger) (Collector, error) {
fs, err := procfs.NewFS(*procPath)
if err != nil {
return nil, fmt.Errorf("failed to open procfs: %w", err)
}
return &softnetCollector{
fs: fs,
processed: prometheus.NewDesc(
prometheus.BuildFQName(namespace, softnetSubsystem, "processed_total"),
"Number of processed packets",
[]string{"cpu"}, nil,
),
dropped: prometheus.NewDesc(
prometheus.BuildFQName(namespace, softnetSubsystem, "dropped_total"),
"Number of dropped packets",
[]string{"cpu"}, nil,
),
timeSqueezed: prometheus.NewDesc(
prometheus.BuildFQName(namespace, softnetSubsystem, "times_squeezed_total"),
"Number of times processing packets ran out of quota",
[]string{"cpu"}, nil,
),
cpuCollision: prometheus.NewDesc(
prometheus.BuildFQName(namespace, softnetSubsystem, "cpu_collision_total"),
"Number of collision occur while obtaining device lock while transmitting",
[]string{"cpu"}, nil,
),
receivedRps: prometheus.NewDesc(
prometheus.BuildFQName(namespace, softnetSubsystem, "received_rps_total"),
"Number of times cpu woken up received_rps",
[]string{"cpu"}, nil,
),
flowLimitCount: prometheus.NewDesc(
prometheus.BuildFQName(namespace, softnetSubsystem, "flow_limit_count_total"),
"Number of times flow limit has been reached",
[]string{"cpu"}, nil,
),
softnetBacklogLen: prometheus.NewDesc(
prometheus.BuildFQName(namespace, softnetSubsystem, "backlog_len"),
"Softnet backlog status",
[]string{"cpu"}, nil,
),
logger: logger,
}, nil
}
// Update gets parsed softnet statistics using procfs.
func (c *softnetCollector) Update(ch chan<- prometheus.Metric) error {
var cpu string
stats, err := c.fs.NetSoftnetStat()
if err != nil {
return fmt.Errorf("could not get softnet statistics: %w", err)
}
for _, cpuStats := range stats {
cpu = strconv.FormatUint(uint64(cpuStats.Index), 10)
ch <- prometheus.MustNewConstMetric(
c.processed,
prometheus.CounterValue,
float64(cpuStats.Processed),
cpu,
)
ch <- prometheus.MustNewConstMetric(
c.dropped,
prometheus.CounterValue,
float64(cpuStats.Dropped),
cpu,
)
ch <- prometheus.MustNewConstMetric(
c.timeSqueezed,
prometheus.CounterValue,
float64(cpuStats.TimeSqueezed),
cpu,
)
ch <- prometheus.MustNewConstMetric(
c.cpuCollision,
prometheus.CounterValue,
float64(cpuStats.CPUCollision),
cpu,
)
ch <- prometheus.MustNewConstMetric(
c.receivedRps,
prometheus.CounterValue,
float64(cpuStats.ReceivedRps),
cpu,
)
ch <- prometheus.MustNewConstMetric(
c.flowLimitCount,
prometheus.CounterValue,
float64(cpuStats.FlowLimitCount),
cpu,
)
ch <- prometheus.MustNewConstMetric(
c.softnetBacklogLen,
prometheus.GaugeValue,
float64(cpuStats.SoftnetBacklogLen),
cpu,
)
}
return nil
}