1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
|
// Copyright 2015 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.
// +build !nostat
package collector
import (
"bufio"
"os"
"strconv"
"strings"
"github.com/prometheus/client_golang/prometheus"
)
const (
userHz = 100
)
type statCollector struct {
cpu *prometheus.Desc
intr *prometheus.Desc
ctxt *prometheus.Desc
forks *prometheus.Desc
btime *prometheus.Desc
procsRunning *prometheus.Desc
procsBlocked *prometheus.Desc
}
func init() {
Factories["stat"] = NewStatCollector
}
// Takes a prometheus registry and returns a new Collector exposing
// kernel/system statistics.
func NewStatCollector() (Collector, error) {
return &statCollector{
cpu: prometheus.NewDesc(
prometheus.BuildFQName(Namespace, "", "cpu"),
"Seconds the cpus spent in each mode.",
[]string{"cpu", "mode"}, nil,
),
intr: prometheus.NewDesc(
prometheus.BuildFQName(Namespace, "", "intr"),
"Total number of interrupts serviced.",
nil, nil,
),
ctxt: prometheus.NewDesc(
prometheus.BuildFQName(Namespace, "", "context_switches"),
"Total number of context switches.",
nil, nil,
),
forks: prometheus.NewDesc(
prometheus.BuildFQName(Namespace, "", "forks"),
"Total number of forks.",
nil, nil,
),
btime: prometheus.NewDesc(
prometheus.BuildFQName(Namespace, "", "boot_time"),
"Node boot time, in unixtime.",
nil, nil,
),
procsRunning: prometheus.NewDesc(
prometheus.BuildFQName(Namespace, "", "procs_running"),
"Number of processes in runnable state.",
nil, nil,
),
procsBlocked: prometheus.NewDesc(
prometheus.BuildFQName(Namespace, "", "procs_blocked"),
"Number of processes blocked waiting for I/O to complete.",
nil, nil,
),
}, nil
}
// Expose kernel and system statistics.
func (c *statCollector) Update(ch chan<- prometheus.Metric) (err error) {
file, err := os.Open(procFilePath("stat"))
if err != nil {
return err
}
defer file.Close()
scanner := bufio.NewScanner(file)
for scanner.Scan() {
parts := strings.Fields(scanner.Text())
if len(parts) == 0 {
continue
}
switch {
case strings.HasPrefix(parts[0], "cpu"):
// Export only per-cpu stats, it can be aggregated up in prometheus.
if parts[0] == "cpu" {
break
}
// Only some of these may be present, depending on kernel version.
cpuFields := []string{"user", "nice", "system", "idle", "iowait", "irq", "softirq", "steal", "guest"}
// OpenVZ guests lack the "guest" CPU field, which needs to be ignored.
expectedFieldNum := len(cpuFields) + 1
if expectedFieldNum > len(parts) {
expectedFieldNum = len(parts)
}
for i, v := range parts[1:expectedFieldNum] {
value, err := strconv.ParseFloat(v, 64)
if err != nil {
return err
}
// Convert from ticks to seconds
value /= userHz
ch <- prometheus.MustNewConstMetric(c.cpu, prometheus.CounterValue, value, parts[0], cpuFields[i])
}
case parts[0] == "intr":
// Only expose the overall number, use the 'interrupts' collector for more detail.
value, err := strconv.ParseFloat(parts[1], 64)
if err != nil {
return err
}
ch <- prometheus.MustNewConstMetric(c.intr, prometheus.CounterValue, value)
case parts[0] == "ctxt":
value, err := strconv.ParseFloat(parts[1], 64)
if err != nil {
return err
}
ch <- prometheus.MustNewConstMetric(c.ctxt, prometheus.CounterValue, value)
case parts[0] == "processes":
value, err := strconv.ParseFloat(parts[1], 64)
if err != nil {
return err
}
ch <- prometheus.MustNewConstMetric(c.forks, prometheus.CounterValue, value)
case parts[0] == "btime":
value, err := strconv.ParseFloat(parts[1], 64)
if err != nil {
return err
}
ch <- prometheus.MustNewConstMetric(c.btime, prometheus.GaugeValue, value)
case parts[0] == "procs_running":
value, err := strconv.ParseFloat(parts[1], 64)
if err != nil {
return err
}
ch <- prometheus.MustNewConstMetric(c.procsRunning, prometheus.GaugeValue, value)
case parts[0] == "procs_blocked":
value, err := strconv.ParseFloat(parts[1], 64)
if err != nil {
return err
}
ch <- prometheus.MustNewConstMetric(c.procsBlocked, prometheus.GaugeValue, value)
}
}
return err
}
|
