mirror of
https://github.com/prometheus/node_exporter.git
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dfa53f835a
* Use `errors.Is()` for unwrapping errors. * Use `%w` error verb in internal error formatting. Signed-off-by: Ben Kochie <superq@gmail.com>
103 lines
2.6 KiB
Go
103 lines
2.6 KiB
Go
// Copyright 2019 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// +build !nosoftnet
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package collector
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import (
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"fmt"
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"strconv"
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"github.com/go-kit/kit/log"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/procfs"
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)
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type softnetCollector struct {
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fs procfs.FS
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processed *prometheus.Desc
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dropped *prometheus.Desc
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timeSqueezed *prometheus.Desc
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logger log.Logger
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}
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const (
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softnetSubsystem = "softnet"
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)
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func init() {
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registerCollector("softnet", defaultEnabled, NewSoftnetCollector)
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}
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// NewSoftnetCollector returns a new Collector exposing softnet metrics.
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func NewSoftnetCollector(logger log.Logger) (Collector, error) {
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fs, err := procfs.NewFS(*procPath)
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if err != nil {
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return nil, fmt.Errorf("failed to open procfs: %w", err)
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}
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return &softnetCollector{
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fs: fs,
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processed: prometheus.NewDesc(
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prometheus.BuildFQName(namespace, softnetSubsystem, "processed_total"),
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"Number of processed packets",
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[]string{"cpu"}, nil,
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),
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dropped: prometheus.NewDesc(
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prometheus.BuildFQName(namespace, softnetSubsystem, "dropped_total"),
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"Number of dropped packets",
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[]string{"cpu"}, nil,
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),
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timeSqueezed: prometheus.NewDesc(
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prometheus.BuildFQName(namespace, softnetSubsystem, "times_squeezed_total"),
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"Number of times processing packets ran out of quota",
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[]string{"cpu"}, nil,
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),
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logger: logger,
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}, nil
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}
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// Update gets parsed softnet statistics using procfs.
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func (c *softnetCollector) Update(ch chan<- prometheus.Metric) error {
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stats, err := c.fs.NetSoftnetStat()
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if err != nil {
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return fmt.Errorf("could not get softnet statistics: %w", err)
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}
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for cpuNumber, cpuStats := range stats {
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cpu := strconv.Itoa(cpuNumber)
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ch <- prometheus.MustNewConstMetric(
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c.processed,
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prometheus.CounterValue,
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float64(cpuStats.Processed),
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cpu,
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)
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ch <- prometheus.MustNewConstMetric(
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c.dropped,
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prometheus.CounterValue,
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float64(cpuStats.Dropped),
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cpu,
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)
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ch <- prometheus.MustNewConstMetric(
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c.timeSqueezed,
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prometheus.CounterValue,
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float64(cpuStats.TimeSqueezed),
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cpu,
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)
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}
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return nil
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}
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