feat(alerting): Show/hide alerting UI using configuration variable

Use configuration variable "show_alerting_ui" to show/hide alerting UI

pkg/api/frontendsettings.go

@@ -140,6 +140,7 @@ func getFrontendSettingsMap(c *middleware.Context) (map[string]interface{}, erro
 		"allowOrgCreate":    (setting.AllowUserOrgCreate && c.IsSignedIn) || c.IsGrafanaAdmin,
 		"authProxyEnabled":  setting.AuthProxyEnabled,
 		"ldapEnabled":       setting.LdapEnabled,
+		"showAlertingUI":    setting.ShowAlertingUI,
 		"buildInfo": map[string]interface{}{
 			"version":       setting.BuildVersion,
 			"commit":        setting.BuildCommit,

pkg/api/index.go

@@ -103,7 +103,7 @@ func setIndexViewData(c *middleware.Context) (*dtos.IndexViewData, error) {
 		Children: dashboardChildNavs,
 	})
 
-	if c.OrgRole == m.ROLE_ADMIN || c.OrgRole == m.ROLE_EDITOR {
+	if setting.ShowAlertingUI && (c.OrgRole == m.ROLE_ADMIN || c.OrgRole == m.ROLE_EDITOR) {
 		alertChildNavs := []*dtos.NavLink{
 			{Text: "Alert List", Url: setting.AppSubUrl + "/alerting/list"},
 			{Text: "Notification channels", Url: setting.AppSubUrl + "/alerting/notifications"},