From 9727c76dff5701287f5962a7535a2836c4927966 Mon Sep 17 00:00:00 2001
From: Dean Roehrich <dean.roehrich@hpe.com>
Date: Mon, 6 Nov 2023 13:35:22 -0600
Subject: [PATCH] Requirements for Prometheus

Add a label to the ServiceMonitor resource that will be common across all
DWS and NNF repos so we can easily tell Prometheus which ones it should select.

Copy the namespace value into config/prometheus so that part of config/ can
be deployed on its own.

Add a ClusterRoleBinding that can be used by a metrics reader process to
debug the metrics endpoint of the controller.  The ClusterRole is already
being installed, and the ServiceAccount is already installed.

Update the deploy.sh script to determine whether or not the ServiceMonitor
resource can be applied.

Signed-off-by: Dean Roehrich <dean.roehrich@hpe.com>
---
 config/prometheus/kustomization.yaml                 |  3 +++
 config/prometheus/monitor.yaml                       |  1 +
 .../rbac/auth_proxy_client_clusterrole_binding.yaml  | 12 ++++++++++++
 config/rbac/kustomization.yaml                       |  1 +
 deploy.sh                                            |  7 +++++++
 5 files changed, 24 insertions(+)
 create mode 100644 config/rbac/auth_proxy_client_clusterrole_binding.yaml

diff --git a/config/prometheus/kustomization.yaml b/config/prometheus/kustomization.yaml
index ed137168..9560cc41 100644
--- a/config/prometheus/kustomization.yaml
+++ b/config/prometheus/kustomization.yaml
@@ -1,2 +1,5 @@
+# Adds namespace to all resources.
+namespace: nnf-dm-system
+
 resources:
 - monitor.yaml
diff --git a/config/prometheus/monitor.yaml b/config/prometheus/monitor.yaml
index d19136ae..55a96aa1 100644
--- a/config/prometheus/monitor.yaml
+++ b/config/prometheus/monitor.yaml
@@ -5,6 +5,7 @@ kind: ServiceMonitor
 metadata:
   labels:
     control-plane: controller-manager
+    prometheus-app: rabbit-nnf
   name: controller-manager-metrics-monitor
   namespace: system
 spec:
diff --git a/config/rbac/auth_proxy_client_clusterrole_binding.yaml b/config/rbac/auth_proxy_client_clusterrole_binding.yaml
new file mode 100644
index 00000000..f7d0f2fc
--- /dev/null
+++ b/config/rbac/auth_proxy_client_clusterrole_binding.yaml
@@ -0,0 +1,12 @@
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  name: metrics-reader-rolebinding
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: metrics-reader
+subjects:
+- kind: ServiceAccount
+  name: controller-manager
+  namespace: system
diff --git a/config/rbac/kustomization.yaml b/config/rbac/kustomization.yaml
index dd8c44a1..8c4e0530 100644
--- a/config/rbac/kustomization.yaml
+++ b/config/rbac/kustomization.yaml
@@ -19,6 +19,7 @@ resources:
 - auth_proxy_role.yaml
 - auth_proxy_role_binding.yaml
 - auth_proxy_client_clusterrole.yaml
+- auth_proxy_client_clusterrole_binding.yaml
 
 configurations:
   - kustomizeconfig.yaml
diff --git a/deploy.sh b/deploy.sh
index d23097c9..f626da0a 100755
--- a/deploy.sh
+++ b/deploy.sh
@@ -47,8 +47,15 @@ deploy)
         $KUSTOMIZE build $OVERLAY_DIR | kubectl apply -f -
         break
     done
+
+    # Deploy the ServiceMonitor resource if its CRD is found. The CRD would
+    # have been installed by a metrics service such as Prometheus.
+    if kubectl get crd servicemonitors.monitoring.coreos.com > /dev/null 2>&1; then
+        $KUSTOMIZE build config/prometheus | kubectl apply -f-
+    fi
     ;;
 undeploy)
+    $KUSTOMIZE build config/prometheus | kubectl delete --ignore-not-found -f-
     # When the DataMovementManager CRD gets deleted all related resource are also
     # removed, so the delete will always fail. We ignore all errors at our
     # own risk.