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
|
// Copyright 2021 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.
package collectors
import (
"database/sql"
"github.com/prometheus/client_golang/prometheus"
)
type dbStatsCollector struct {
db *sql.DB
maxOpenConnections *prometheus.Desc
openConnections *prometheus.Desc
inUseConnections *prometheus.Desc
idleConnections *prometheus.Desc
waitCount *prometheus.Desc
waitDuration *prometheus.Desc
maxIdleClosed *prometheus.Desc
maxIdleTimeClosed *prometheus.Desc
maxLifetimeClosed *prometheus.Desc
}
// NewDBStatsCollector returns a collector that exports metrics about the given *sql.DB.
// See https://golang.org/pkg/database/sql/#DBStats for more information on stats.
func NewDBStatsCollector(db *sql.DB, dbName string) prometheus.Collector {
fqName := func(name string) string {
return "go_sql_" + name
}
return &dbStatsCollector{
db: db,
maxOpenConnections: prometheus.NewDesc(
fqName("max_open_connections"),
"Maximum number of open connections to the database.",
nil, prometheus.Labels{"db_name": dbName},
),
openConnections: prometheus.NewDesc(
fqName("open_connections"),
"The number of established connections both in use and idle.",
nil, prometheus.Labels{"db_name": dbName},
),
inUseConnections: prometheus.NewDesc(
fqName("in_use_connections"),
"The number of connections currently in use.",
nil, prometheus.Labels{"db_name": dbName},
),
idleConnections: prometheus.NewDesc(
fqName("idle_connections"),
"The number of idle connections.",
nil, prometheus.Labels{"db_name": dbName},
),
waitCount: prometheus.NewDesc(
fqName("wait_count_total"),
"The total number of connections waited for.",
nil, prometheus.Labels{"db_name": dbName},
),
waitDuration: prometheus.NewDesc(
fqName("wait_duration_seconds_total"),
"The total time blocked waiting for a new connection.",
nil, prometheus.Labels{"db_name": dbName},
),
maxIdleClosed: prometheus.NewDesc(
fqName("max_idle_closed_total"),
"The total number of connections closed due to SetMaxIdleConns.",
nil, prometheus.Labels{"db_name": dbName},
),
maxIdleTimeClosed: prometheus.NewDesc(
fqName("max_idle_time_closed_total"),
"The total number of connections closed due to SetConnMaxIdleTime.",
nil, prometheus.Labels{"db_name": dbName},
),
maxLifetimeClosed: prometheus.NewDesc(
fqName("max_lifetime_closed_total"),
"The total number of connections closed due to SetConnMaxLifetime.",
nil, prometheus.Labels{"db_name": dbName},
),
}
}
// Describe implements Collector.
func (c *dbStatsCollector) Describe(ch chan<- *prometheus.Desc) {
ch <- c.maxOpenConnections
ch <- c.openConnections
ch <- c.inUseConnections
ch <- c.idleConnections
ch <- c.waitCount
ch <- c.waitDuration
ch <- c.maxIdleClosed
ch <- c.maxLifetimeClosed
ch <- c.maxIdleTimeClosed
}
// Collect implements Collector.
func (c *dbStatsCollector) Collect(ch chan<- prometheus.Metric) {
stats := c.db.Stats()
ch <- prometheus.MustNewConstMetric(c.maxOpenConnections, prometheus.GaugeValue, float64(stats.MaxOpenConnections))
ch <- prometheus.MustNewConstMetric(c.openConnections, prometheus.GaugeValue, float64(stats.OpenConnections))
ch <- prometheus.MustNewConstMetric(c.inUseConnections, prometheus.GaugeValue, float64(stats.InUse))
ch <- prometheus.MustNewConstMetric(c.idleConnections, prometheus.GaugeValue, float64(stats.Idle))
ch <- prometheus.MustNewConstMetric(c.waitCount, prometheus.CounterValue, float64(stats.WaitCount))
ch <- prometheus.MustNewConstMetric(c.waitDuration, prometheus.CounterValue, stats.WaitDuration.Seconds())
ch <- prometheus.MustNewConstMetric(c.maxIdleClosed, prometheus.CounterValue, float64(stats.MaxIdleClosed))
ch <- prometheus.MustNewConstMetric(c.maxLifetimeClosed, prometheus.CounterValue, float64(stats.MaxLifetimeClosed))
ch <- prometheus.MustNewConstMetric(c.maxIdleTimeClosed, prometheus.CounterValue, float64(stats.MaxIdleTimeClosed))
}
|
