Add node exporter

Signed-off-by: Michel Hollands <michel.hollands@gmail.com>

charts/meta-monitoring/templates/agent/config.yaml

@@ -135,6 +135,52 @@ data:
         ca_file = "/var/run/secrets/kubernetes.io/serviceaccount/ca.crt"
       }
     }
+
+    prometheus.exporter.unix {}
+
+    prometheus.scrape "node_exporter" {
+      targets = prometheus.exporter.unix.targets
+      forward_to = [prometheus.relabel.node_exporter.receiver]
+
+      job_name = "node-exporter"
+      scrape_interval = "15s"
+    }
+
+    prometheus.relabel "node_exporter" {
+      forward_to = [ {{ include "agent.prometheus_write_targets" . }} ]
+
+      rule {
+        replacement = env("HOSTNAME")
+        target_label = "nodename"
+      }
+      rule {
+        replacement = "node-exporter"
+        target_label = "job"
+      }
+      rule {
+        source_labels = ["__meta_kubernetes_node_name"]
+        target_label = "node"
+      }
+      rule {
+        source_labels = ["__meta_kubernetes_namespace"]
+        target_label  = "namespace"
+      }
+      rule {
+        source_labels = ["__meta_kubernetes_pod_name"]
+        target_label  = "pod"
+      }
+      rule {
+        source_labels = ["__meta_kubernetes_namespace", "__meta_kubernetes_pod_label_app_kubernetes_io_name", "__meta_kubernetes_pod_label_app_kubernetes_io_component"]
+        separator = "/"
+        regex = "(.*)/(.*)/(.*)"
+        replacement = "${1}/${2}-${3}"
+        target_label = "job"
+      }
+      rule {
+        target_label = "cluster"
+        replacement = "{{- .Values.clusterName -}}"
+      }
+    }
     {{- end }}
 
     // Traces