test(hotplug): reenable vpc test in focal (#5492)

After the fix for LP: 2055397 is released, we can re-enable this tests.

Add additional assertions to verify that every route has metrics
configured.

tests/integration_tests/modules/test_hotplug.py

@@ -302,7 +302,6 @@ def test_multi_nic_hotplug(setup_image, session_cloud: IntegrationCloud):
         verify_clean_boot(client)
 
 
-@pytest.mark.skipif(CURRENT_RELEASE <= FOCAL, reason="See LP: #2055397")
 @pytest.mark.skipif(PLATFORM != "ec2", reason="test is ec2 specific")
 @pytest.mark.skip(reason="IMDS race, see GH-5373. Unskip when fixed.")
 def test_multi_nic_hotplug_vpc(setup_image, session_cloud: IntegrationCloud):
@@ -353,6 +352,12 @@ def test_multi_nic_hotplug_vpc(setup_image, session_cloud: IntegrationCloud):
         r = bastion.execute(f"ping -c1 {secondary_priv_ip6}")
         assert r.ok, r.stdout
 
+        # Check every route has metrics associated. See LP: #2055397
+        ip_route_show = client.execute("ip route show")
+        assert ip_route_show.ok, ip_route_show.stderr
+        for route in ip_route_show.splitlines():
+            assert "metric" in route, "Expected metric to be in the route"
+
         # Remove new NIC
         client.instance.remove_network_interface(secondary_priv_ip4)
         _wait_till_hotplug_complete(client, expected_runs=2)