Move /cluster/audit to /audit (#19708)

As the audit metrics are server level and not 
overall cluster level.

cmd/metrics-v3-audit.go

@@ -42,9 +42,9 @@ var (
 		targetID)
 )
 
-// loadClusterAuditMetrics - `MetricsLoaderFn` for cluster audit
+// loadAuditMetrics - `MetricsLoaderFn` for audit
 // such as failed messages and total messages.
-func loadClusterAuditMetrics(_ context.Context, m MetricValues, c *metricsCache) error {
+func loadAuditMetrics(_ context.Context, m MetricValues, c *metricsCache) error {
 	audit := logger.CurrentStats()
 	for id, st := range audit {
 		labels := []string{targetID, id}

cmd/metrics-v3.go

@@ -48,9 +48,10 @@ const (
 	clusterUsageObjectsCollectorPath collectorPath = "/cluster/usage/objects"
 	clusterUsageBucketsCollectorPath collectorPath = "/cluster/usage/buckets"
 	clusterErasureSetCollectorPath   collectorPath = "/cluster/erasure-set"
-	clusterAuditCollectorPath        collectorPath = "/cluster/audit"
 	clusterNotificationCollectorPath collectorPath = "/cluster/notification"
 	clusterIAMCollectorPath          collectorPath = "/cluster/iam"
+
+	auditCollectorPath collectorPath = "/audit"
 )
 
 const (
@@ -264,15 +265,6 @@ func newMetricGroups(r *prometheus.Registry) *metricsV3Collection {
 		loadClusterErasureSetMetrics,
 	)
 
-	clusterAuditMG := NewMetricsGroup(clusterAuditCollectorPath,
-		[]MetricDescriptor{
-			auditFailedMessagesMD,
-			auditTargetQueueLengthMD,
-			auditTotalMessagesMD,
-		},
-		loadClusterAuditMetrics,
-	)
-
 	clusterNotificationMG := NewMetricsGroup(clusterNotificationCollectorPath,
 		[]MetricDescriptor{
 			notificationCurrentSendInProgressMD,
@@ -299,6 +291,15 @@ func newMetricGroups(r *prometheus.Registry) *metricsV3Collection {
 		loadClusterIAMMetrics,
 	)
 
+	auditMG := NewMetricsGroup(auditCollectorPath,
+		[]MetricDescriptor{
+			auditFailedMessagesMD,
+			auditTargetQueueLengthMD,
+			auditTotalMessagesMD,
+		},
+		loadAuditMetrics,
+	)
+
 	allMetricGroups := []*MetricsGroup{
 		apiRequestsMG,
 		apiBucketMG,
@@ -313,9 +314,10 @@ func newMetricGroups(r *prometheus.Registry) *metricsV3Collection {
 		clusterUsageObjectsMG,
 		clusterUsageBucketsMG,
 		clusterErasureSetMG,
-		clusterAuditMG,
 		clusterNotificationMG,
 		clusterIAMMG,
+
+		auditMG,
 	}
 
 	// Bucket metrics are special, they always include the bucket label. These

docs/metrics/v3.md

@@ -34,6 +34,13 @@ These are metrics about requests served by the (current) node.
 | `/api/bucket`   | Metrics over all requests split by bucket labels |
 |                 |                                                  |
 
+### Audit metrics
+
+These are metrics about the minio process and the node.
+
+| Path     | Description                            |
+|----------|----------------------------------------|
+| `/audit` | Metrics related to audit functionality |
 
 ### System metrics
 
@@ -99,6 +106,14 @@ The standard metrics group for GoCollector is not shown below.
 | `minio_bucket_api_5xx_errors_total`          | `counter` | Total number of requests with 5xx errors for a bucket            | `bucket,name,type,server,pool_index`    |
 | `minio_bucket_api_ttfb_seconds_distribution` | `counter` | Distribution of time to first byte across API calls for a bucket | `bucket,name,le,type,server,pool_index` |
 
+### `/audit`
+
+| Name                              | Type      | Help                                                     | Labels             |
+|-----------------------------------|-----------|----------------------------------------------------------|--------------------|
+| `minio_audit_failed_messages`     | `counter` | Total number of messages that failed to send since start | `target_id,server` |
+| `minio_audit_target_queue_length` | `gauge`   | Number of unsent messages in queue for target            | `target_id,server` |
+| `minio_audit_total_messages`      | `counter` | Total number of messages sent since start                | `target_id,server` |
+
 ### `/system/drive`
 
 | Name                                           | Type      | Help                                                               | Labels                                              |
@@ -199,14 +214,6 @@ The standard metrics group for GoCollector is not shown below.
 | `minio_cluster_health_capacity_usable_total_bytes` | `gauge` | Total cluster usable storage capacity in bytes |        |
 | `minio_cluster_health_capacity_usable_free_bytes`  | `gauge` | Total cluster usable storage free in bytes     |        |
 
-### `/cluster/audit`
-
-| Name                                      | Type      | Help                                                     | Labels      |
-|-------------------------------------------|-----------|----------------------------------------------------------|-------------|
-| `minio_cluster_audit_failed_messages`     | `counter` | Total number of messages that failed to send since start | `target_id` |
-| `minio_cluster_audit_target_queue_length` | `gauge`   | Number of unsent messages in queue for target            | `target_id` |
-| `minio_cluster_audit_total_messages`      | `counter` | Total number of messages sent since start                | `target_id` |
-
 ### `/cluster/usage/objects`
 
 | Name                                                     | Type    | Help                                                           | Labels  |