fix: prometheus configMap issue for k3s (#12)

* Add default namespace
* fix prometheus configmap for k3s
* Add comment to k3s configmap

Author: abeatrix

base/monitoring/prometheus/rbac/prometheus.ConfigMap.yaml

@@ -1,7 +1,7 @@
 apiVersion: v1
 kind: ConfigMap
 metadata:
-  name: prometheus
+  name: prometheus-rbac
 data:
   prometheus.yml: |
     global:
@@ -28,6 +28,7 @@ data:
       - source_labels: [__meta_kubernetes_namespace, __meta_kubernetes_service_name, __meta_kubernetes_endpoint_port_name, __meta_kubernetes_pod_node_name]
         action: keep
         regex: default;kubernetes;https
+
     - job_name: 'kubernetes-nodes'
       scheme: https
       tls_config:
@@ -65,8 +66,9 @@ data:
         regex: (.+)
         action: replace
         target_label: container_label_io_kubernetes_pod_name
+
     ############################################################################################################
-    
+
     - job_name: 'kubernetes-service-endpoints'
       kubernetes_sd_configs:
       - role: endpoints
@@ -126,6 +128,7 @@ data:
         target_label: ns
       - source_labels: [__meta_kubernetes_service_name]
         target_label: kubernetes_name
+
     - job_name: 'kubernetes-pods'
       kubernetes_sd_configs:
       - role: pod
@@ -156,12 +159,13 @@ data:
         target_label: ns
       metric_relabel_configs:
       - source_labels: [kubernetes_io_hostname]
-        regex: sourcegraph-0
+        regex: sourcegraph-0 # ACTION: replace 'sourcegraph-0' with your node name
         action: keep
       - source_labels: [namespace]
-        regex: default
+        regex: default # ACTION: replace 'default' with your namespace
         action: keep
       ############################################################################################################
+
     # Scrape prometheus itself for metrics.
     - job_name: 'builtin-prometheus'
       static_configs:
@@ -173,4 +177,4 @@ data:
       static_configs:
         - targets: ['127.0.0.1:9093']
           labels:
-            app: alertmanager
+            app: alertmanager

components/clusters/k3s/monitoring/patches/prometheus.ConfigMap.yaml

@@ -1,10 +1,12 @@
 # Includes RBAC resources
 apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
+namespace: ns-sourcegraph
 resources:
   # Sourcegraph Main Stack
   - ../../base/sourcegraph
 components:
+  - ../../components/resources/namespace
   # Use resources for a size-XS instance
   - ../../components/sizes/xs
   # This configures the Sourcegraph instance and networking to work in a k3s cluster

examples/k3s/kustomization.yaml

@@ -1,6 +1,7 @@
 # Includes RBAC resources
 apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
+namespace: default
 resources:
   # Sourcegraph Main Stack
   - ../../../base/sourcegraph

examples/k3s/l/kustomization.yaml

@@ -1,6 +1,7 @@
 # Includes RBAC resources
 apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
+namespace: default
 resources:
   # Sourcegraph Main Stack
   - ../../../base/sourcegraph

examples/k3s/m/kustomization.yaml

@@ -1,6 +1,7 @@
 # Includes RBAC resources
 apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
+namespace: default
 resources:
   # Sourcegraph Main Stack
   - ../../../base/sourcegraph

examples/k3s/s/kustomization.yaml

@@ -1,6 +1,7 @@
 # Includes RBAC resources
 apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
+namespace: default
 resources:
   # Sourcegraph Main Stack
   - ../../../base/sourcegraph

examples/k3s/xl/kustomization.yaml

@@ -1,6 +1,7 @@
 # Includes RBAC resources
 apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
+namespace: default
 resources:
   # Sourcegraph Main Stack
   - ../../../base/sourcegraph