Updates for Minio Server and mc releases (#958)

Updates for mc and MinIO server releases
    
- Adds `client` command to mc support perf
- Adds new metrics
- Corrects typos and minor issues in metric related docs
    
Closes #955
Closes #956

source/operations/monitoring/collect-minio-metrics-using-prometheus.rst

@@ -55,7 +55,7 @@ Use the :mc-cmd:`mc admin prometheus generate` command to generate the scrape co
 
    .. tab-item:: Nodes
 
-      The following command scrapes metrics for a nodes on the MinIO Server.
+      The following command scrapes metrics for a node on the MinIO Server.
 
       .. code-block:: shell
          :class: copyable

source/operations/monitoring/grafana.rst

@@ -32,6 +32,10 @@ To track changes to the Grafana dashboard, introspect the JSON files for the `se
 
 .. _minio-server-grafana-metrics:
 
+To track changes to the Grafana dashboard, introspect the JSON files for the `server <https://github.com/minio/minio/blob/master/docs/metrics/prometheus/grafana/minio-dashboard.json>`__ or `bucket <https://github.com/minio/minio/blob/master/docs/metrics/prometheus/grafana/minio-bucket.json>`__ dashboards in the MinIO Server GitHub repository.
+
+.. _minio-server-grafana-metrics:
+
 MinIO Server Metrics Dashboard
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 

source/operations/monitoring/metrics-and-alerts.rst

@@ -10,7 +10,7 @@ Metrics and Alerts
 
 .. contents:: Table of Contents
    :local:
-   :depth: 2
+   :depth: 3
 
 MinIO publishes cluster and node metrics using the :prometheus-docs:`Prometheus Data Model <data_model/>`.
 You can use any scraping tool to pull metrics data from MinIO for further analysis and alerting.
@@ -159,14 +159,14 @@ Cluster Usage Metrics
 Drive Metrics
 +++++++++++++
 
-``minio_cluster_disk_offline_total``
-  Total drives offline.
+``minio_cluster_drive_offline_total``
+  Total drives offline in this cluster.
 
-``minio_cluster_disk_online_total``
-  Total drives online.
+``minio_cluster_drive_online_total``
+  Total drives online in this cluster.
 
-``minio_cluster_disk_total``
-  Total drives.
+``minio_cluster_drive_total``
+  Total drives in this cluster.
 
 ILM Metrics
 +++++++++++
@@ -352,29 +352,35 @@ These metrics can be obtained from any MinIO server once per collection.
 Drive Metrics
 +++++++++++++
 
-``minio_node_disk_free_bytes``
-  Total storage available on a drive.
+``minio_node_drive_free_bytes``
+  Total storage available on a drive in this node.
 
-``minio_node_disk_free_inodes``
-  Total free inodes.
+``minio_node_drive_free_inodes``
+  Total free inodes in this node.
 
-``minio_node_disk_latency_us``
+``minio_node_drive_latency_us``
   Average last minute latency in µs for drive API storage operations.
 
-``minio_node_disk_offline_total``
-  Total drives offline.
+``minio_node_drive_offline_total``
+  Total drives offline in this node.
 
-``minio_node_disk_online_total``
-  Total drives online.
+``minio_node_drive_online_total``
+  Total drives online in this node.
 
-``minio_node_disk_total``
-  Total drives.
+``minio_node_drive_total``
+  Total drives in this node.
 
-``minio_node_disk_total_bytes``
-  Total storage on a drive.
+``minio_node_drive_total_bytes``
+  Total storage on a drive in this node.
 
-``minio_node_disk_used_bytes``
-  Total storage used on a drive.
+``minio_node_drive_used_bytes``
+  Total storage used on a drive in this node.
+
+``minio_node_drive_errors_timeout``
+  Total number of timeout errors since server start in this node.
+
+``minio_node_drive_errors_availability``
+  Total number of I/O errors, permission denied, and timeouts since server start in this node.
 
 File Metrics
 ++++++++++++