add regex in example

Author: Bibas

pages/cockpit/how-to/federate-scaleway-metrics.mdx

@@ -48,7 +48,7 @@ scrape_configs:
           - '$SCW_READ_TOKEN'
     params:
       'match[]':
-        - '{__name__="instance_server_cpu_seconds_total"}'
+        - '{__name__="instance_.*"}'
         - '{region="fr-par"}'
     static_configs:
       - targets:
@@ -60,7 +60,7 @@ scrape_configs:
 </Message>
 
 Modify the different `match[]` parameters according to the metrics you want to retrieve. In this example, you will federate:
-  - All metrics called `instance_server_cpu_seconds_total`
+  - All metrics with a name that starts with `instance_`
   - All metrics with the label `region` with the value `fr-par`
 
 You can also set `honor_labels` to `false` if you prefer to not override the different labels that your Prometheus could set that conflict with Scaleway metrics label.