Feat: Add LDAPStaleConnections metric

Introduce a new gauge metric to track the number of stale connections in the LDAP pool. This addition helps in monitoring and managing the health of the LDAP connections effectively.

Signed-off-by: Christian Roessner <[email protected]>

Author: Christian Roessner

server/backend/ldap.go

@@ -381,6 +381,7 @@ func (l *LDAPPool) updateSingleConnectionStatus(index int) int {
 func (l *LDAPPool) closeIdleConnections(openConnections, idlePoolSize, poolSize int) {
 	needClosing := max(openConnections-idlePoolSize, 0)
 
+	stats.LDAPStaleConnections.WithLabelValues(l.name).Set(float64(needClosing))
 	util.DebugModule(global.DbgLDAPPool, global.LogKeyLDAPPoolName, l.name, global.LogKeyMsg, "State open connections", "needClosing", needClosing, "openConnections", openConnections, "idlePoolSize", idlePoolSize)
 
 	//goland:noinspection GoDfaConstantCondition

server/stats/statistics.go

@@ -241,6 +241,12 @@ var (
 		Help: "Number of currently opened connections",
 	}, []string{"pool"})
 
+	// LDAPStaleConnections counts the number of currently staled connections in the LDAP pool which need closing.
+	LDAPStaleConnections = promauto.NewGaugeVec(prometheus.GaugeOpts{
+		Name: "ldap_pool_stale_connections_total",
+		Help: "Number of currently staled connections",
+	}, []string{"pool"})
+
 	// LDAPPoolSize is a gauge metric that represents the size of the LDAP connection pool.
 	LDAPPoolSize = promauto.NewGaugeVec(prometheus.GaugeOpts{
 		Name: "ldap_pool_size",