Add prometheus support

Signed-off-by: John Harris <john.harris@konghq.com>

charts/flagger/templates/prometheus.yaml

@@ -201,6 +201,35 @@ data:
         source_labels:
         - __meta_kubernetes_pod_name
         target_label: kubernetes_pod_name
+
+    # scrape config for Kuma dataplanes
+    - job_name: 'kuma-dataplanes'
+      scrape_interval: "5s"
+      relabel_configs:
+        - source_labels:
+            - k8s_kuma_io_name
+          regex: "(.*)"
+          target_label: pod
+        - source_labels:
+            - k8s_kuma_io_namespace
+          regex: "(.*)"
+          target_label: namespace
+        - source_labels:
+            - __meta_kuma_mesh
+          regex: "(.*)"
+          target_label: mesh
+        - source_labels:
+            - __meta_kuma_dataplane
+          regex: "(.*)"
+          target_label: dataplane
+        - source_labels:
+            - __meta_kuma_service
+          regex: "(.*)"
+          target_label: service
+        - action: labelmap
+          regex: __meta_kuma_label_(.+)
+      kuma_sd_configs:
+        - server: http://kuma-control-plane.kuma-system:5676
 ---
 apiVersion: apps/v1
 kind: Deployment

charts/flagger/templates/rbac.yaml

@@ -195,6 +195,19 @@ rules:
     - update
     - patch
     - delete
+  - apiGroups:
+      - kuma.io
+    resources:
+      - trafficroutes
+      - trafficroutes/finalizers
+    verbs:
+      - get
+      - list
+      - watch
+      - create
+      - update
+      - patch
+      - delete
   - nonResourceURLs:
       - /version
     verbs:

kustomize/base/prometheus/prometheus.yml

@@ -132,3 +132,32 @@ scrape_configs:
     source_labels:
     - __meta_kubernetes_pod_name
     target_label: kubernetes_pod_name
+
+# scrape config for Kuma dataplanes
+- job_name: 'kuma-dataplanes'
+  scrape_interval: "5s"
+  relabel_configs:
+    - source_labels:
+        - k8s_kuma_io_name
+      regex: "(.*)"
+      target_label: pod
+    - source_labels:
+        - k8s_kuma_io_namespace
+      regex: "(.*)"
+      target_label: namespace
+    - source_labels:
+        - __meta_kuma_mesh
+      regex: "(.*)"
+      target_label: mesh
+    - source_labels:
+        - __meta_kuma_dataplane
+      regex: "(.*)"
+      target_label: dataplane
+    - source_labels:
+        - __meta_kuma_service
+      regex: "(.*)"
+      target_label: service
+    - action: labelmap
+      regex: __meta_kuma_label_(.+)
+  kuma_sd_configs:
+    - server: http://kuma-control-plane.kuma-system:5676