prometheus/postgres_exporter
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multi-server-exporter multi server exporter is introduced

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This commit is contained in:
Anthony Regeda
2018-09-04 13:02:20 +03:00
committed by Will Rouesnel
parent 72446a5b1e
commit 1d6a733ba2
6 changed files with 487 additions and 287 deletions
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18
cmd/postgres_exporter/pg_setting.go
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@@ -1,8 +1,6 @@
package main
import (
"database/sql"
"errors"
"fmt"
"math"
"strconv"
@@ -13,8 +11,8 @@ import (
)
// Query the pg_settings view containing runtime variables
func querySettings(ch chan<- prometheus.Metric, db *sql.DB) error {
log.Debugln("Querying pg_setting view")
func querySettings(ch chan<- prometheus.Metric, server *Server) error {
log.Debugf("Querying pg_setting view on %q", server)
// pg_settings docs: https://www.postgresql.org/docs/current/static/view-pg-settings.html
//
@@ -22,9 +20,9 @@ func querySettings(ch chan<- prometheus.Metric, db *sql.DB) error {
// types in normaliseUnit() below
query := "SELECT name, setting, COALESCE(unit, ''), short_desc, vartype FROM pg_settings WHERE vartype IN ('bool', 'integer', 'real');"
rows, err := db.Query(query)
rows, err := server.db.Query(query)
if err != nil {
return errors.New(fmt.Sprintln("Error running query on database: ", namespace, err))
return fmt.Errorf("Error running query on database %q: %s %v", server, namespace, err)
}
defer rows.Close() // nolint: errcheck
@@ -32,10 +30,10 @@ func querySettings(ch chan<- prometheus.Metric, db *sql.DB) error {
s := &pgSetting{}
err = rows.Scan(&s.name, &s.setting, &s.unit, &s.shortDesc, &s.vartype)
if err != nil {
return errors.New(fmt.Sprintln("Error retrieving rows:", namespace, err))
return fmt.Errorf("Error retrieving rows on %q: %s %v", server, namespace, err)
}
ch <- s.metric()
ch <- s.metric(server.labels)
}
return nil
@@ -47,7 +45,7 @@ type pgSetting struct {
name, setting, unit, shortDesc, vartype string
}
func (s *pgSetting) metric() prometheus.Metric {
func (s *pgSetting) metric(labels prometheus.Labels) prometheus.Metric {
var (
err error
name = strings.Replace(s.name, ".", "_", -1)
@@ -78,7 +76,7 @@ func (s *pgSetting) metric() prometheus.Metric {
panic(fmt.Sprintf("Unsupported vartype %q", s.vartype))
}
desc := newDesc(subsystem, name, shortDesc)
desc := newDesc(subsystem, name, shortDesc, labels)
return prometheus.MustNewConstMetric(desc, prometheus.GaugeValue, val)
}