Re-organized grafana dashboards (#19157)

Moved different dashboards to their specific directories. Also
mentioned that these dashbards are examples of how to create
graphs using MinIO provided and metrics and customers should
change / add graphs on their specific need basis.

Signed-off-by: Shubhendu Ram Tripathi <shubhendu@minio.io>

docs/metrics/README.md

@@ -19,6 +19,12 @@ MinIO allows reading metrics for the entire cluster from any single node. This a
 The additional node specific metrics which include additional go metrics or process metrics are exposed at
 `<Address for MinIO Node>/minio/v2/metrics/node`.
 
+The additional bucket specific metrics which include additional go metrics or process metrics are exposed at
+`<Address for MinIO Node>/minio/v2/metrics/bucket`.
+
+The additional resource specific metrics which include additional go metrics or process metrics are exposed at
+`<Address for MinIO Node>/minio/v2/metrics/resource`.
+
 To use this endpoint, setup Prometheus to scrape data from this endpoint. Read more on how to configure and use Prometheus to monitor MinIO server in [How to monitor MinIO server with Prometheus](https://github.com/minio/minio/blob/master/docs/metrics/prometheus/README.md).
 
 ### **Deprecated metrics monitoring**

docs/metrics/prometheus/README.md

@@ -49,7 +49,7 @@ minio server ~/test
 
 > If MinIO is configured to expose metrics without authentication, you don't need to use `mc` to generate prometheus config. You can skip reading further and move to 3.2 section.
 
-The Prometheus endpoint in MinIO requires authentication by default. Prometheus supports a bearer token approach to authenticate prometheus scrape requests, override the default Prometheus config with the one generated using mc. To generate a Prometheus config for an alias, use [mc](https://min.io/docs/minio/linux/reference/minio-mc.html#quickstart) as follows `mc admin prometheus generate <alias>`.
+The Prometheus endpoint in MinIO requires authentication by default. Prometheus supports a bearer token approach to authenticate prometheus scrape requests, override the default Prometheus config with the one generated using mc. To generate a Prometheus config for an alias, use [mc](https://min.io/docs/minio/linux/reference/minio-mc.html#quickstart) as follows `mc admin prometheus generate <alias> [METRIC-TYPE]`. The valid values for METRIC-TYPE are `cluster`, `node`, `bucket` and `resource` and if not mentioned, it defaults to `cluster`.
 
 The command will generate the `scrape_configs` section of the prometheus.yml as follows:
 
@@ -76,6 +76,28 @@ scrape_configs:
   - targets: ['localhost:9000']
 ```
 
+##### Node centric (optional)
+
+```yaml
+- job_name: minio-job-node
+  bearer_token: <secret>
+  metrics_path: /minio/v2/metrics/node
+  scheme: http
+  static_configs:
+  - targets: ['localhost:9000']
+```
+
+##### Resource centric (optional)
+
+```yaml
+- job_name: minio-job-resource
+  bearer_token: <secret>
+  metrics_path: /minio/v2/metrics/resource
+  scheme: http
+  static_configs:
+  - targets: ['localhost:9000']
+```
+
 #### 3.2 Public Prometheus config
 
 If Prometheus endpoint authentication type is set to `public`. Following prometheus config is sufficient to start scraping metrics data from MinIO.
@@ -116,6 +138,19 @@ scrape_configs:
   - targets: ['localhost:9000']
 ```
 
+##### Resource (optional)
+
+Optionally you can also collect resource metrics.
+
+```yaml
+scrape_configs:
+- job_name: minio-job
+  metrics_path: /minio/v2/metrics/resource
+  scheme: http
+  static_configs:
+  - targets: ['localhost:9000']
+```
+
 ### 4. Update `scrape_configs` section in prometheus.yml
 
 To authorize every scrape request, copy and paste the generated `scrape_configs` section in the prometheus.yml and restart the Prometheus service.
@@ -140,6 +175,8 @@ After Prometheus is configured, you can use Grafana to visualize MinIO metrics.
 
 - MinIO exports Prometheus compatible data by default as an authorized endpoint at `/minio/v2/metrics/cluster`. 
 - MinIO exports Prometheus compatible data by default which is bucket centric as an authorized endpoint at `/minio/v2/metrics/bucket`.
+- MinIO exports Prometheus compatible data by default which is node centric as an authorized endpoint at `/minio/v2/metrics/node`.
+- MinIO exports Prometheus compatible data by default which is resource centric as an authorized endpoint at `/minio/v2/metrics/resource`.
 
 All of these can be accessed via Prometheus dashboard. A sample list of exposed metrics along with their definition is available on our public demo server at
 

docs/metrics/prometheus/grafana/README.md

@@ -15,10 +15,12 @@ Refer to the dashboard [json file here](https://raw.githubusercontent.com/minio/
 
 ![Grafana](https://raw.githubusercontent.com/minio/minio/master/docs/metrics/prometheus/grafana/grafana-minio.png)
 
-Replication metrics can be viewed in the Grafana dashboard using [json file here](https://raw.githubusercontent.com/minio/minio/master/docs/metrics/prometheus/grafana/minio-replication.json)
+Replication metrics can be viewed in the Grafana dashboard using [json file here](https://raw.githubusercontent.com/minio/minio/master/docs/metrics/prometheus/grafana/replication/minio-replication.json)
 
-![Grafana](https://raw.githubusercontent.com/minio/minio/master/docs/metrics/prometheus/grafana/grafana-replication.png)
+![Grafana](https://raw.githubusercontent.com/minio/minio/master/docs/metrics/prometheus/grafana/replication/grafana-replication.png)
 
-Bucket metrics can be viewed in the Grafana dashboard using [json file here](https://raw.githubusercontent.com/minio/minio/master/docs/metrics/prometheus/grafana/minio-bucket.json)
+Bucket metrics can be viewed in the Grafana dashboard using [json file here](https://raw.githubusercontent.com/minio/minio/master/docs/metrics/prometheus/grafana/bubcket/minio-bucket.json)
 
-![Grafana](https://raw.githubusercontent.com/minio/minio/master/docs/metrics/prometheus/grafana/grafana-bucket.png)
+![Grafana](https://raw.githubusercontent.com/minio/minio/master/docs/metrics/prometheus/grafana/bucket/grafana-bucket.png)
+
+Note: All these dashboards are provided as an example and need basis they should be customized as well as new graphs should be added.