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feat(dbmanager): report pool max size and total connections opened

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Add MaxOpenConnections to provider and connection stats, exposed as the
max state of dbmanager_connection_pool_size. Count physical dials through a
counting driver connector and export dbmanager_connections_opened_total;
existing_db pools derive an approximate count from sql.DBStats.
This commit is contained in:
Hein
2026-09-30 15:46:41 +02:00
parent d3a99550d9
commit 178d40587d
11 changed files with 191 additions and 51 deletions
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pkg/dbmanager/metrics.go
+13 -2
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@@ -32,7 +32,7 @@ var (
Name: "dbmanager_connection_pool_size",
Help: "Current connection pool size",
},
[]string{"name", "type", "state"}, // state: open, idle, in_use
[]string{"name", "type", "state"}, // state: open, idle, in_use, max
)
// connectionWaitCount tracks how many times connections had to wait for availability
@@ -71,6 +71,15 @@ var (
[]string{"name", "type"},
)
// connectionOpened tracks physical connections ever opened
connectionOpened = promauto.NewCounterVec(
prometheus.CounterOpts{
Name: "dbmanager_connections_opened_total",
Help: "Total physical connections opened by the pool",
},
[]string{"name", "type"},
)
// connectionIdleClosed tracks connections closed due to max idle time
connectionIdleClosed = promauto.NewCounterVec(
prometheus.CounterOpts{
@@ -115,6 +124,7 @@ func (m *connectionManager) PublishMetrics() {
connectionPoolSize.WithLabelValues(name, string(connStats.Type), "open").Set(float64(connStats.OpenConnections))
connectionPoolSize.WithLabelValues(name, string(connStats.Type), "idle").Set(float64(connStats.Idle))
connectionPoolSize.WithLabelValues(name, string(connStats.Type), "in_use").Set(float64(connStats.InUse))
connectionPoolSize.WithLabelValues(name, string(connStats.Type), "max").Set(float64(connStats.MaxOpenConnections))
// sql.DBStats values are cumulative, so add only the growth since
// the last publish to keep these true counters.
@@ -122,6 +132,7 @@ func (m *connectionManager) PublishMetrics() {
connectionWaitCount.With(labels).Add(float64(connStats.WaitCount - prev.WaitCount))
connectionWaitDuration.With(labels).Add((connStats.WaitDuration - prev.WaitDuration).Seconds())
connectionLifetimeClosed.With(labels).Add(float64(connStats.MaxLifetimeClosed - prev.MaxLifetimeClosed))
connectionOpened.With(labels).Add(float64(connStats.TotalOpened - prev.TotalOpened))
connectionIdleClosed.With(labels).Add(float64(connStats.MaxIdleClosed - prev.MaxIdleClosed))
}
}
@@ -152,7 +163,7 @@ func (p *publishedStats) swap(name string, cur *ConnectionStats) ConnectionStats
p.mu.Lock()
defer p.mu.Unlock()
prev := p.last[name]
if cur.WaitCount < prev.WaitCount || cur.MaxIdleClosed < prev.MaxIdleClosed || cur.MaxLifetimeClosed < prev.MaxLifetimeClosed {
if cur.WaitCount < prev.WaitCount || cur.MaxIdleClosed < prev.MaxIdleClosed || cur.MaxLifetimeClosed < prev.MaxLifetimeClosed || cur.TotalOpened < prev.TotalOpened {
prev = ConnectionStats{}
}
p.last[name] = *cur