Allow to configure relabelings on serviceMonitor

Author: mmadoo

docs_src/tutorials/kubernetes.md

@@ -22,6 +22,7 @@ to be installed from the source code.
 | `serviceMonitor.interval`      | The interval at which metrics should be scraped                                               | `1m`                     |
 | `serviceMonitor.labels`        | Extra labels for the ServiceMonitor                                                           | `{}`                     |
 | `serviceMonitor.scrapeTimeout` | Specify the timeout after which the scrape is ended                                           | `30s`                    |
+| `serviceMonitor.relabelings`   | Allow to add extra labels to metrics                                                          | Add node metrics         |
 
 #### Other parameters
 | Name                                       | Description                                                                 | Value                     |

helm/scaphandre/values.yaml

@@ -15,7 +15,7 @@ scaphandre:
   command: prometheus
   args: {}
   extraArgs:
-    containers:
+    containers: null
 #  rustBacktrace: '1'
 
 # Run as root user to get proper permissions
@@ -35,6 +35,12 @@ serviceMonitor:
   # Specify the timeout after which the scrape is ended
   scrapeTimeout: 30s
 
+  relabelings:
+  - action: replace
+    sourceLabels:
+      - __meta_kubernetes_pod_node_name
+    targetLabel: node
+
 tolerations:
   # Tolerate all taints for observability
   - operator: "Exists"