Use prometheus-alertmanager-test-webhook image from quay.io/prometheus-operator (#5025)

* example/alertmanager-webhook: build image for amd64 and arm64

Closes #5012

Signed-off-by: Simon Pasquier <spasquie@redhat.com>

* test/e2e: remove use of legacy coreos image

Signed-off-by: Simon Pasquier <spasquie@redhat.com>

Signed-off-by: Simon Pasquier <spasquie@redhat.com>

.gitignore

@@ -2,6 +2,7 @@
 /admission-webhook
 /po-lint
 /prometheus-config-reloader
+example/alertmanager-webhook/linux/
 .build/
 *~
 *.tgz

example/alertmanager-webhook/Dockerfile

@@ -0,0 +1,7 @@
+FROM scratch
+
+ARG ARCH="amd64"
+
+COPY linux/${ARCH}/alertmanager-webhook /bin/alertmanager-webhook
+
+ENTRYPOINT ["/bin/alertmanager-webhook"]

example/alertmanager-webhook/Makefile

@@ -0,0 +1,14 @@
+IMAGE ?= quay.io/prometheus-operator/prometheus-alertmanager-test-webhook
+TAG ?= latest
+
+.PHONY: build
+build:
+	GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -tags netgo -o linux/amd64/ .
+	GOOS=linux GOARCH=arm64 CGO_ENABLED=0 go build -tags netgo -o linux/arm64/ .
+
+.PHONY: push
+push: build
+	buildah manifest create $(IMAGE):$(TAG)
+	buildah bud --arch amd64 --build-arg ARCH=amd64 --manifest $(IMAGE):$(TAG) -t $(IMAGE):$(TAG)-amd64 .
+	buildah bud --arch arm64 --build-arg ARCH=arm64 --manifest $(IMAGE):$(TAG) -t $(IMAGE):$(TAG)-arm64 .
+	buildah manifest push --all $(IMAGE):$(TAG) docker://$(IMAGE):$(TAG)

example/alertmanager-webhook/README.md

@@ -0,0 +1,15 @@
+This directory contains a very simple program that can receive alert
+notifications from Alertmanager. It is used by the end-to-end tests to verify
+that Alertmanager works as expected.
+
+The program is available at `quay.io/prometheus-operator/prometheus-alertmanager-test-webhook:latest`.
+
+## Updating the image on quay.io
+
+The image requires very few updates since the program is very simple and only used for testing.
+
+Pre-requisites:
+* Credentials to push the image to `quay.io/prometheus-operator/prometheus-alertmanager-test-webhook`.
+* Buildah CLI + the `qemu-user-static` package.
+
+Running `make manifest` should be all that is needed.

example/alertmanager-webhook/main.go

@@ -19,8 +19,13 @@ import (
 	"net/http"
 )
 
+const (
+	port = "5001"
+)
+
 func main() {
-	_ = http.ListenAndServe(":5001", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+	fmt.Printf("Listening for Alertmanager notifications on :%s\n", port)
+	_ = http.ListenAndServe(":"+port, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		fmt.Println("Alertmanager Notification Payload Received")
 	}))
 }

example/alertmanger-webhook/Dockerfile

@@ -1,5 +0,0 @@
-FROM quay.io/prometheus/busybox:latest
-
-COPY main /bin/main
-
-ENTRYPOINT ["/bin/main"]

example/alertmanger-webhook/Makefile

@@ -1,3 +0,0 @@
-all:
-	CGO_ENABLED=0 go build --installsuffix cgo main.go
-	docker build -t quay.io/coreos/prometheus-alertmanager-test-webhook .

test/e2e/alertmanager_test.go

@@ -528,7 +528,7 @@ func testAMZeroDowntimeRollingDeployment(t *testing.T) {
 					Containers: []v1.Container{
 						{
 							Name:  "webhook-server",
-							Image: "quay.io/coreos/prometheus-alertmanager-test-webhook",
+							Image: "quay.io/prometheus-operator/prometheus-alertmanager-test-webhook:latest",
 							Ports: []v1.ContainerPort{
 								{
 									Name:          "web",