Add demo for podmonitor

.github/workflows/ci.yml

@@ -29,6 +29,4 @@ jobs:
           ./install.sh
       - name: Check example-app podmonitor
         run: |
-          kubectl apply -f ./manifests
-          kubectl get podmonitors.monitoring.coreos.com -n example-app
-          ./curl.sh
+          ./external-pod-monitor.sh

external-pod-monitor.sh

@@ -0,0 +1,26 @@
+#!/bin/bash
+
+# Check metrics from example-app
+
+set -euxo pipefail
+
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+
+NS=example-app
+
+# Deploy app
+kubectl apply -f "$DIR"/manifests/
+kubectl rollout status deployment example-app -n "$NS" --timeout=300s
+kubectl get podmonitor -n "$NS"
+
+# Deploy pod to check metrics are available
+kubectl delete pod -l run=curl -n "$NS" --force --grace-period=0 || true
+kubectl run -n "$NS" --image=curlimages/curl:8.12.1 curl -- sleep infinity
+kubectl wait --for=condition=Ready pod -l run=curl -n "$NS" --timeout=300s
+kubectl exec -n "$NS" -it curl -- curl -Lk "http://example-app.$NS:8080/metrics"
+
+# TODO: Check metrics are available in Prometheus
+PROM_URL="prometheus-stack-kube-prom-prometheus.monitoring"
+kubectl exec -n "$NS" -it curl -- curl -G http://$PROM_URL:9090/api/v1/targets/metadata \
+    --data-urlencode 'match_target={namespace="example-app"}' \
+    --data-urlencode 'limit=2' | grep "$NS"

manifests/deployment.yaml

@@ -1,3 +1,8 @@
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: example-app
+---
 apiVersion: apps/v1
 kind: Deployment
 metadata: