chore: fix TestPrometheusVersionUpgrade

This change reduces the scope of the upgrade tests: we're now testing
from the current LTS version (v2.45.0) to the latest stable release.

Closes #7039

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

.github/workflows/test-prom-version-upgrade.yaml

@@ -9,6 +9,11 @@ jobs:
     name: Upgrade Prometheus
     runs-on: ubuntu-latest
     steps:
+    - name: Reclaim disk space
+      run: |
+        docker image prune --force --all
+        sudo rm -rf /usr/share/dotnet
+        sudo rm -rf /usr/local/lib/android
     - uses: actions/checkout@v4
     - name: Import environment variables from file
       run: |
@@ -19,10 +24,6 @@ jobs:
       with:
         go-version: '${{ env.golang-version }}'
         check-latest: true
-    - name: Build images
-      run: |
-        export SHELL=/bin/bash
-        make build image
     - name: Start KinD
       uses: helm/kind-action@v1.10.0
       with:
@@ -36,7 +37,7 @@ jobs:
         kubectl wait --for=condition=Ready pods --all --all-namespaces --timeout=300s
         kubectl cluster-info
         kubectl get pods -A
-    - name: Load images
+    - name: Build and load images
       run: |
         make test-e2e-images
         kubectl apply -f scripts/kind-rbac.yaml

Documentation/compatibility.md

@@ -30,32 +30,6 @@ v0.31.2
 Prometheus Operator supports all Prometheus versions >= v2.0.0. The operator's end-to-end tests verify that the operator can deploy the following Prometheus versions:
 
 ```$ mdox-exec="go run ./cmd/po-docgen/. compatibility"
-* v2.37.0
-* v2.37.1
-* v2.37.2
-* v2.37.3
-* v2.37.4
-* v2.37.5
-* v2.37.6
-* v2.37.7
-* v2.37.8
-* v2.38.0
-* v2.39.0
-* v2.39.1
-* v2.39.2
-* v2.40.0
-* v2.40.1
-* v2.40.2
-* v2.40.3
-* v2.40.4
-* v2.40.5
-* v2.40.6
-* v2.40.7
-* v2.41.0
-* v2.42.0
-* v2.43.0
-* v2.43.1
-* v2.44.0
 * v2.45.0
 * v2.46.0
 * v2.47.0
@@ -71,7 +45,6 @@ Prometheus Operator supports all Prometheus versions >= v2.0.0. The operator's e
 * v2.51.1
 * v2.51.2
 * v2.52.0
-* v2.52.1
 * v2.53.0
 * v2.53.1
 * v2.54.0

pkg/operator/defaults.go

@@ -48,35 +48,9 @@ var (
 	DefaultPrometheusConfigReloaderImage = "quay.io/prometheus-operator/prometheus-config-reloader:v" + version.Version
 
 	// PrometheusCompatibilityMatrix is a list of supported prometheus versions.
-	// prometheus-operator end-to-end tests verify that the operator can deploy from LTS n-1 to the latest stable.
+	// prometheus-operator end-to-end tests verify that the operator can deploy from the current LTS version to the latest stable release.
 	// This list should be updated every time a new LTS is released.
 	PrometheusCompatibilityMatrix = []string{
-		"v2.37.0",
-		"v2.37.1",
-		"v2.37.2",
-		"v2.37.3",
-		"v2.37.4",
-		"v2.37.5",
-		"v2.37.6",
-		"v2.37.7",
-		"v2.37.8",
-		"v2.38.0",
-		"v2.39.0",
-		"v2.39.1",
-		"v2.39.2",
-		"v2.40.0",
-		"v2.40.1",
-		"v2.40.2",
-		"v2.40.3",
-		"v2.40.4",
-		"v2.40.5",
-		"v2.40.6",
-		"v2.40.7",
-		"v2.41.0",
-		"v2.42.0",
-		"v2.43.0",
-		"v2.43.1",
-		"v2.44.0",
 		"v2.45.0",
 		"v2.46.0",
 		"v2.47.0",
@@ -92,7 +66,8 @@ var (
 		"v2.51.1",
 		"v2.51.2",
 		"v2.52.0",
-		"v2.52.1",
+		// The v2.52.1 image tag is missing from docker.io and quay.io registries.
+		// "v2.52.1",
 		"v2.53.0",
 		"v2.53.1",
 		"v2.54.0",

test/e2e/prometheus_test.go

@@ -853,22 +853,24 @@ func testPromVersionMigration(t *testing.T) {
 	}
 
 	for _, v := range compatibilityMatrix {
-		p, err = framework.PatchPrometheusAndWaitUntilReady(
-			context.Background(),
-			p.Name,
-			ns,
-			monitoringv1.PrometheusSpec{
-				CommonPrometheusFields: monitoringv1.CommonPrometheusFields{
-					Version: v,
+		t.Run("to "+v, func(t *testing.T) {
+			p, err = framework.PatchPrometheusAndWaitUntilReady(
+				context.Background(),
+				name,
+				ns,
+				monitoringv1.PrometheusSpec{
+					CommonPrometheusFields: monitoringv1.CommonPrometheusFields{
+						Version: v,
+					},
 				},
-			},
-		)
-		if err != nil {
-			t.Fatalf("update to version %s: %v", v, err)
-		}
-		if err := framework.WaitForPrometheusRunImageAndReady(context.Background(), ns, p); err != nil {
-			t.Fatalf("update to version %s: %v", v, err)
-		}
+			)
+			if err != nil {
+				t.Fatalf("update to version %s: %v", v, err)
+			}
+			if err := framework.WaitForPrometheusRunImageAndReady(context.Background(), ns, p); err != nil {
+				t.Fatalf("update to version %s: %v", v, err)
+			}
+		})
 	}
 }