Collect account resource consumption and settings

Adds three new metrics that collects configured reserved memory and storage along with how many bytes are currently used.

collector/jsz.go

@@ -39,6 +39,11 @@ type jszCollector struct {
 	maxMemory  *prometheus.Desc
 	maxStorage *prometheus.Desc
 
+	// Account stats
+	maxAccountMemory  *prometheus.Desc
+	maxAccountStorage *prometheus.Desc
+	accountStorage    *prometheus.Desc
+
 	// Stream stats
 	streamMessages      *prometheus.Desc
 	streamBytes         *prometheus.Desc
@@ -74,6 +79,11 @@ func newJszCollector(system, endpoint string, servers []*CollectedServer) promet
 	streamLabels = append(streamLabels, "is_stream_leader")
 	streamLabels = append(streamLabels, "stream_raft_group")
 
+	var accountLabels []string
+	accountLabels = append(accountLabels, serverLabels...)
+	accountLabels = append(accountLabels, "account")
+	accountLabels = append(accountLabels, "account_id")
+
 	var consumerLabels []string
 	consumerLabels = append(consumerLabels, streamLabels...)
 	consumerLabels = append(consumerLabels, "consumer_name")
@@ -135,6 +145,29 @@ func newJszCollector(system, endpoint string, servers []*CollectedServer) promet
 			serverLabels,
 			nil,
 		),
+		// jetstream_account_max_memory
+		maxAccountMemory: prometheus.NewDesc(
+			prometheus.BuildFQName(system, "account", "max_memory"),
+			"JetStream Account Max Memory in bytes",
+			accountLabels,
+			nil,
+		),
+
+		// jetstream_account_max_storage
+		maxAccountStorage: prometheus.NewDesc(
+			prometheus.BuildFQName(system, "account", "max_storage"),
+			"JetStream Account Max Storage in bytes",
+			accountLabels,
+			nil,
+		),
+
+		// jetstream_account_total_bytes
+		accountStorage: prometheus.NewDesc(
+			prometheus.BuildFQName(system, "account", "total_bytes"),
+			"Total number of bytes stored in JetStream account",
+			accountLabels,
+			nil,
+		),
 		// jetstream_stream_total_messages
 		streamMessages: prometheus.NewDesc(
 			prometheus.BuildFQName(system, "stream", "total_messages"),
@@ -340,6 +373,19 @@ func (nc *jszCollector) Collect(ch chan<- prometheus.Metric) {
 		for _, account := range resp.AccountDetails {
 			accountName = account.Name
 			accountID = account.Id
+
+			accountMetric := func(key *prometheus.Desc, value float64) prometheus.Metric {
+				return prometheus.MustNewConstMetric(key, prometheus.GaugeValue, value,
+					// Server Labels
+					serverID, serverName, clusterName, jsDomain, clusterLeader, isMetaLeader,
+					// Account Labels
+					accountName, accountID)
+			}
+
+			ch <- accountMetric(nc.maxAccountStorage, float64(account.ReservedStore))
+			ch <- accountMetric(nc.maxAccountMemory, float64(account.ReservedMemory))
+			ch <- accountMetric(nc.accountStorage, float64(account.Store))
+
 			for _, stream := range account.Streams {
 				streamName = stream.Name
 				if stream.Cluster != nil {