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Add database stats to Prometheus exporter

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This commit is contained in:
Frédéric Guillot 2021-05-22 20:27:13 -07:00 committed by fguillot
parent 012eb61c52
commit 36d3b1e9fb
2 changed files with 78 additions and 2 deletions
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72
metric/metric.go
View file

@ -78,6 +78,62 @@ var (
},
[]string{"status"},
)
dbOpenConnectionsGauge = prometheus.NewGauge(
prometheus.GaugeOpts{
Namespace: "miniflux",
Name: "db_open_connections",
Help: "The number of established connections both in use and idle",
},
)
dbConnectionsInUseGauge = prometheus.NewGauge(
prometheus.GaugeOpts{
Namespace: "miniflux",
Name: "db_connections_in_use",
Help: "The number of connections currently in use",
},
)
dbConnectionsIdleGauge = prometheus.NewGauge(
prometheus.GaugeOpts{
Namespace: "miniflux",
Name: "db_connections_idle",
Help: "The number of idle connections",
},
)
dbConnectionsWaitCountGauge = prometheus.NewGauge(
prometheus.GaugeOpts{
Namespace: "miniflux",
Name: "db_connections_wait_count",
Help: "The total number of connections waited for",
},
)
dbConnectionsMaxIdleClosedGauge = prometheus.NewGauge(
prometheus.GaugeOpts{
Namespace: "miniflux",
Name: "db_connections_max_idle_closed",
Help: "The total number of connections closed due to SetMaxIdleConns",
},
)
dbConnectionsMaxIdleTimeClosedGauge = prometheus.NewGauge(
prometheus.GaugeOpts{
Namespace: "miniflux",
Name: "db_connections_max_idle_time_closed",
Help: "The total number of connections closed due to SetConnMaxIdleTime",
},
)
dbConnectionsMaxLifetimeClosedGauge = prometheus.NewGauge(
prometheus.GaugeOpts{
Namespace: "miniflux",
Name: "db_connections_max_lifetime_closed",
Help: "The total number of connections closed due to SetConnMaxLifetime",
},
)
)
// Collector represents a metric collector.
@ -95,6 +151,13 @@ func NewCollector(store *storage.Storage, refreshInterval int) *Collector {
prometheus.MustRegister(feedsGauge)
prometheus.MustRegister(brokenFeedsGauge)
prometheus.MustRegister(entriesGauge)
prometheus.MustRegister(dbOpenConnectionsGauge)
prometheus.MustRegister(dbConnectionsInUseGauge)
prometheus.MustRegister(dbConnectionsIdleGauge)
prometheus.MustRegister(dbConnectionsWaitCountGauge)
prometheus.MustRegister(dbConnectionsMaxIdleClosedGauge)
prometheus.MustRegister(dbConnectionsMaxIdleTimeClosedGauge)
prometheus.MustRegister(dbConnectionsMaxLifetimeClosedGauge)
return &Collector{store, refreshInterval}
}
@ -116,5 +179,14 @@ func (c *Collector) GatherStorageMetrics() {
for status, count := range entriesCount {
entriesGauge.WithLabelValues(status).Set(float64(count))
}
dbStats := c.store.DBStats()
dbOpenConnectionsGauge.Set(float64(dbStats.OpenConnections))
dbConnectionsInUseGauge.Set(float64(dbStats.InUse))
dbConnectionsIdleGauge.Set(float64(dbStats.Idle))
dbConnectionsWaitCountGauge.Set(float64(dbStats.WaitCount))
dbConnectionsMaxIdleClosedGauge.Set(float64(dbStats.MaxIdleClosed))
dbConnectionsMaxIdleTimeClosedGauge.Set(float64(dbStats.MaxIdleTimeClosed))
dbConnectionsMaxLifetimeClosedGauge.Set(float64(dbStats.MaxLifetimeClosed))
}
}

8
storage/storage.go
View file

@ -31,6 +31,10 @@ func (s *Storage) DatabaseVersion() string {
// Ping checks if the database connection works.
func (s *Storage) Ping() error {
_, err := s.db.Exec(`SELECT true`)
return err
return s.db.Ping()
}
// DBStats returns database statistics.
func (s *Storage) DBStats() sql.DBStats {
return s.db.Stats()
}