docs: customMetricsNamespaces for Cloudwatch provisioning (#26457)

devenv/datasources.yaml

@@ -1,4 +1,3 @@
-
 apiVersion: 1
 
 datasources:
@@ -226,6 +225,7 @@ datasources:
     jsonData:
       authType: credentials
       defaultRegion: eu-west-2
+      customMetricsNamespaces: "CWAgent"
 
   # Keep to test old /api/prom API
   - name: gdev-loki-0.3
@@ -270,5 +270,3 @@ datasources:
     access: proxy
     url: http://localhost:9411
     editable: false
-
-

docs/sources/features/datasources/cloudwatch.md

@@ -26,7 +26,7 @@ build dashboards or use Explore with CloudWatch metrics and CloudWatch Logs.
 > forget to check your log file (try looking in /var/log/grafana/grafana.log).
 
 | Name                       | Description                                                                                                              |
-| -------------------------- | ------------------------------------------------------------------------------------------------------- |
+| -------------------------- | ------------------------------------------------------------------------------------------------------------------------ |
 | _Name_                     | The data source name. This is how you refer to the data source in panels and queries.                                    |
 | _Default_                  | Default data source means that it will be pre-selected for new panels.                                                   |
 | _Default Region_           | Used in query editor to set region (can be changed on per query basis)                                                   |
@@ -385,6 +385,7 @@ datasources:
     jsonData:
       authType: credentials
       defaultRegion: eu-west-2
+      customMetricsNamespaces: 'CWAgent,CustomNameSpace'
 ```
 
 ### Using `accessKey` and `secretKey`