tidb cloud: add more Prometheus monitoring metrics

tidb-cloud/monitor-prometheus-and-grafana-integration.md

@@ -55,7 +55,13 @@ To get the `scrape_config` file for Prometheus, do the following:
 After your Prometheus service is reading metrics from TiDB Cloud, you can use Grafana GUI dashboards to visualize the metrics as follows:
 
 1. Download the Grafana dashboard JSON of TiDB Cloud [here](https://github.com/pingcap/docs/blob/master/tidb-cloud/monitor-prometheus-and-grafana-integration-grafana-dashboard-UI.json).
-2. [Import this JSON to your own Grafana GUI](https://grafana.com/docs/grafana/v8.5/dashboards/export-import/#import-dashboard) to visualize the metrics.
+
+2. [Import this JSON to your own Grafana GUI](https://grafana.com/docs/grafana/v8.5/dashboards/export-import/#import-dashboard) to visualize the metrics. 
+
+    > **Note:**
+    >
+    > If you are already using Prometheus and Grafana to monitor TiDB Cloud and want to incorporate the newly available metrics, it is recommended that you create a new dashboard instead of directly updating the JSON of the existing one.
+
 3. (Optional) Customize the dashboard as needed by adding or removing panels, changing data sources, and modifying display options.
 
 For more information about how to use Grafana, see [Grafana documentation](https://grafana.com/docs/grafana/latest/getting-started/getting-started-prometheus/).
@@ -88,6 +94,15 @@ Prometheus tracks the following metric data for your TiDB clusters.
 | tidbcloud_node_cpu_capacity_cores | gauge | cluster_name: `<cluster name>`<br/>instance: `tidb-0\|tidb-1…\|tikv-0…\|tiflash-0…`<br/>component: `tidb\|tikv\|tiflash` | The CPU limit cores of TiDB/TiKV/TiFlash nodes |
 | tidbcloud_node_memory_used_bytes | gauge | cluster_name: `<cluster name>`<br/>instance: `tidb-0\|tidb-1…\|tikv-0…\|tiflash-0…`<br/>component: `tidb\|tikv\|tiflash` | The used memory bytes of TiDB/TiKV/TiFlash nodes |
 | tidbcloud_node_memory_capacity_bytes | gauge | cluster_name: `<cluster name>`<br/>instance: `tidb-0\|tidb-1…\|tikv-0…\|tiflash-0…`<br/>component: `tidb\|tikv\|tiflash` | The memory capacity bytes of TiDB/TiKV/TiFlash nodes |
+| tidbcloud_node_storage_available_bytes | gauge | instance: `tidb-0\|tidb-1\|...`<br/>component: `tikv\|tiflash`<br/>cluster_name: `<cluster name>` | The available disk space in bytes for TiKV/TiFlash nodes |
+| tidbcloud_disk_read_latency | histogram | instance: `tidb-0\|tidb-1\|...`<br/>component: `tikv\|tiflash`<br/>cluster_name: `<cluster name>`<br/>`device`: `nvme.*\|dm.*` | The read latency in seconds per storage device |
+| tidbcloud_disk_write_latency | histogram | instance: `tidb-0\|tidb-1\|...`<br/>component: `tikv\|tiflash`<br/>cluster_name: `<cluster name>`<br/>`device`: `nvme.*\|dm.*` | The write latency in seconds per storage device |
+| tidbcloud_kv_request_duration | histogram | instance: `tidb-0\|tidb-1\|...`<br/>component: `tikv`<br/>cluster_name: `<cluster name>`<br/>`type`: `BatchGet\|Commit\|Prewrite\|...` | The duration in seconds of TiKV requests by type |
+| tidbcloud_component_uptime | histogram | instance: `tidb-0\|tidb-1\|...`<br/>component: `tidb\|tikv\|pd\|...`<br/>cluster_name: `<cluster name>` | The uptime in seconds of TiDB components |
+| tidbcloud_ticdc_owner_resolved_ts_lag | gauge | changefeed_id: `<changefeed-id>`<br/>cluster_name: `<cluster name>` | The resolved timestamp lag in seconds for changefeed owner |
+| tidbcloud_changefeed_status | gauge | changefeed_id: `<changefeed-id>`<br/>cluster_name: `<cluster name>` | Changefeed status:<br/>`-1`: Unknown<br/>`0`: Normal<br/>`1`: Warning<br/>`2`: Failed<br/>`3`: Stopped<br/>`4`: Finished<br/>`6`: Warning<br/>`7`: Other |
+| tidbcloud_resource_manager_resource_unit_read_request_unit | gauge | cluster_name: `<cluster name>`<br/>resource_group: `<group-name>` | The read request units consumed by Resource Manager |
+| tidbcloud_resource_manager_resource_unit_write_request_unit | gauge | cluster_name: `<cluster name>`<br/>resource_group: `<group-name>` | The write request units consumed by Resource Manager |
 
 ## FAQ