mirror of
https://github.com/prometheus/node_exporter.git
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1a67c6224a
I think it makes sense for "drops" to sit alongside the queue length gauges in prom stats because they are all neighbors in procfs (source of these stats). Moreover, in reading the commit log message for the original creating work for udp_queues, I think there may have been some misreading or confusion between the word "state" and the common short-form of "stats" to mean "statistics". The original author "chose the name 'udp_queue' instead of 'udpstat' as UDP has no state"; I believe that 'udpstat' might actually be the more appropriate name. Signed-off-by: Chris Cleeland <chris.cleeland@gmail.com>
95 lines
2.8 KiB
Go
95 lines
2.8 KiB
Go
// Copyright 2015 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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//go:build !noudp_queues
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// +build !noudp_queues
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package collector
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import (
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"errors"
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"fmt"
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"log/slog"
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"os"
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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 (
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udpQueuesCollector struct {
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fs procfs.FS
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desc *prometheus.Desc
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logger *slog.Logger
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}
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)
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func init() {
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registerCollector("udp_queues", defaultEnabled, NewUDPqueuesCollector)
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}
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// NewUDPqueuesCollector returns a new Collector exposing network udp queued bytes.
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func NewUDPqueuesCollector(logger *slog.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 &udpQueuesCollector{
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fs: fs,
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desc: prometheus.NewDesc(
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prometheus.BuildFQName(namespace, "udp", "queues"),
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"Number of allocated memory in the kernel for UDP datagrams in bytes.",
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[]string{"queue", "ip"}, nil,
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),
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logger: logger,
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}, nil
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}
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func (c *udpQueuesCollector) Update(ch chan<- prometheus.Metric) error {
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s4, errIPv4 := c.fs.NetUDPSummary()
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if errIPv4 == nil {
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ch <- prometheus.MustNewConstMetric(c.desc, prometheus.GaugeValue, float64(s4.TxQueueLength), "tx", "v4")
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ch <- prometheus.MustNewConstMetric(c.desc, prometheus.GaugeValue, float64(s4.RxQueueLength), "rx", "v4")
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if s4.Drops != nil {
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ch <- prometheus.MustNewConstMetric(c.desc, prometheus.CounterValue, float64(*s4.Drops), "drops", "v4")
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}
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} else {
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if errors.Is(errIPv4, os.ErrNotExist) {
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c.logger.Debug("not collecting ipv4 based metrics")
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} else {
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return fmt.Errorf("couldn't get udp queued bytes: %w", errIPv4)
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}
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}
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s6, errIPv6 := c.fs.NetUDP6Summary()
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if errIPv6 == nil {
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ch <- prometheus.MustNewConstMetric(c.desc, prometheus.GaugeValue, float64(s6.TxQueueLength), "tx", "v6")
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ch <- prometheus.MustNewConstMetric(c.desc, prometheus.GaugeValue, float64(s6.RxQueueLength), "rx", "v6")
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if s6.Drops != nil {
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ch <- prometheus.MustNewConstMetric(c.desc, prometheus.CounterValue, float64(*s6.Drops), "drops", "v6")
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}
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} else {
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if errors.Is(errIPv6, os.ErrNotExist) {
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c.logger.Debug("not collecting ipv6 based metrics")
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} else {
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return fmt.Errorf("couldn't get udp6 queued bytes: %w", errIPv6)
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}
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}
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if errors.Is(errIPv4, os.ErrNotExist) && errors.Is(errIPv6, os.ErrNotExist) {
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return ErrNoData
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}
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return nil
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}
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