fix: pin grafana and prometheus revisions

Refs canonical/bundle-kubeflow#688
Refs canonical/bundle-kubeflow#690

tests/integration/test_charm.py

@@ -186,8 +186,29 @@ async def test_prometheus_grafana_integration(ops_test: OpsTest):
     prometheus_scrape_charm = "prometheus-scrape-config-k8s"
     scrape_config = {"scrape_interval": "5s"}
 
-    await ops_test.model.deploy(prometheus, channel="latest/beta", trust=True)
-    await ops_test.model.deploy(grafana, channel="latest/beta", trust=True)
+    # FIXME: Unpin revision once https://github.com/canonical/bundle-kubeflow/issues/688 is closed
+    await ops_test.juju(
+        "deploy",
+        prometheus,
+        "--channel",
+        "latest/edge",
+        "--revision",
+        "137",
+        "--trust",
+        check=True,
+    )
+    # FIXME: Unpin revision once https://github.com/canonical/bundle-kubeflow/issues/690 is closed
+    await ops_test.juju(
+        "deploy",
+        grafana,
+        "--channel",
+        "latest/edge",
+        "--revision",
+        "89",
+        "--trust",
+        check=True,
+    )
+
     await ops_test.model.add_relation(
         f"{prometheus}:grafana-dashboard", f"{grafana}:grafana-dashboard"
     )