Update revision variable for Grafana Dashboard (caraml-dev#35)

* Update revision variable for Grafana from Turing UI

Show metrics for all revision when current page is at router level.
Show metrics for a specific revision when current page is at router version level.

This requires the linked dashboard to support variables with All selection.

ui/src/hooks/useMonitoring.js

@@ -30,10 +30,9 @@ export const useMonitoring = () => {
   const { project } = useContext(CurrentProjectContext);
 
   const getMonitoringDashboardUrl = useCallback(
-    (envName, routerName, revision) => {
+    (envName, routerName, revision="$_all") => {
       const clusterName = getEnvironmentCluster(envName, environments);
       const projectName = !!project ? project.name : undefined;
-
       return getMonitoringLink(clusterName, projectName, routerName, revision);
     },
     [project, environments]

ui/src/router/details/components/page_navigation/RouterDetailsPageNavigation.js

@@ -39,8 +39,7 @@ export const RouterDetailsPageNavigation = ({
       ),
       href: getMonitoringDashboardUrl(
         router.environment_name,
-        router.name,
-        config.version
+        router.name
       ),
       disabled: !config.version
     }

ui/src/router/list/ListRoutersTable.js

@@ -124,8 +124,7 @@ const ListRoutersTable = ({ items, isLoaded, error, onRowClick }) => {
         const monitoringLink = item.config
           ? getMonitoringDashboardUrl(
               item.environment_name,
-              item.name,
-              item.config.version
+              item.name
             )
           : undefined;