Build both old & new UI into Prometheus, allow choosing via feature flag

This keeps the old "react-app" directory in its existing location (to make
it easier to merge changes from the main branch), but separates it from the
npm workspaces setup. Thus it now needs to be npm-installed/built/linted
separately. This is a bit hacky, but should only be needed temporarily,
until the old UI can be removed.

Signed-off-by: Julius Volz <julius.volz@gmail.com>

.gitignore

@@ -22,7 +22,8 @@ benchmark.txt
 /documentation/examples/remote_storage/example_write_adapter/example_write_adapter
 
 npm_licenses.tar.bz2
-/web/ui/static/react
+/web/ui/static/react-app
+/web/ui/static/mantine-ui
 
 /vendor
 /.build

Makefile

@@ -48,6 +48,10 @@ ui-bump-version:
 .PHONY: ui-install
 ui-install:
 	cd $(UI_PATH) && npm install
+	# The old React app has been separated from the npm workspaces setup to avoid
+	# issues with conflicting dependencies. This is a temporary solution until the
+	# new Mantine-based UI is fully integrated and the old app can be removed.
+	cd $(UI_PATH)/react-app && npm install
 
 .PHONY: ui-build
 ui-build:
@@ -64,6 +68,10 @@ ui-test:
 .PHONY: ui-lint
 ui-lint:
 	cd $(UI_PATH) && npm run lint
+	# The old React app has been separated from the npm workspaces setup to avoid
+	# issues with conflicting dependencies. This is a temporary solution until the
+	# new Mantine-based UI is fully integrated and the old app can be removed.
+	cd $(UI_PATH)/react-app && npm run lint
 
 .PHONY: assets
 assets: ui-install ui-build

cmd/prometheus/main.go

@@ -230,6 +230,9 @@ func (c *flagConfig) setFeatureListOptions(logger log.Logger) error {
 				continue
 			case "promql-at-modifier", "promql-negative-offset":
 				level.Warn(logger).Log("msg", "This option for --enable-feature is now permanently enabled and therefore a no-op.", "option", o)
+			case "new-ui":
+				c.web.UseNewUI = true
+				level.Info(logger).Log("msg", "Serving experimental new web UI.")
 			default:
 				level.Warn(logger).Log("msg", "Unknown option for --enable-feature", "option", o)
 			}
@@ -446,7 +449,7 @@ func main() {
 	a.Flag("scrape.discovery-reload-interval", "Interval used by scrape manager to throttle target groups updates.").
 		Hidden().Default("5s").SetValue(&cfg.scrape.DiscoveryReloadInterval)
 
-	a.Flag("enable-feature", "Comma separated feature names to enable. Valid options: agent, auto-gomemlimit, exemplar-storage, expand-external-labels, memory-snapshot-on-shutdown, promql-at-modifier, promql-negative-offset, promql-per-step-stats, promql-experimental-functions, remote-write-receiver (DEPRECATED), extra-scrape-metrics, new-service-discovery-manager, auto-gomaxprocs, no-default-scrape-port, native-histograms, otlp-write-receiver. See https://prometheus.io/docs/prometheus/latest/feature_flags/ for more details.").
+	a.Flag("enable-feature", "Comma separated feature names to enable. Valid options: agent, auto-gomemlimit, exemplar-storage, expand-external-labels, memory-snapshot-on-shutdown, promql-at-modifier, promql-negative-offset, promql-per-step-stats, promql-experimental-functions, remote-write-receiver (DEPRECATED), extra-scrape-metrics, new-service-discovery-manager, auto-gomaxprocs, no-default-scrape-port, native-histograms, otlp-write-receiver, new-ui. See https://prometheus.io/docs/prometheus/latest/feature_flags/ for more details.").
 		Default("").StringsVar(&cfg.featureList)
 
 	promlogflag.AddFlags(a, &cfg.promlogConfig)

docs/feature_flags.md

@@ -224,3 +224,9 @@ When the `concurrent-rule-eval` feature flag is enabled, rules without any depen
 This has the potential to improve rule group evaluation latency and resource utilization at the expense of adding more concurrent query load.
 
 The number of concurrent rule evaluations can be configured with `--rules.max-concurrent-rule-evals`, which is set to `4` by default.
+
+## Experimental new web UI
+
+Enables the new experimental web UI instead of the old and stable web UI. The new UI is a complete rewrite and aims to be cleaner, less cluttered, and more modern under the hood. It is not feature complete yet and is still under active development.
+
+`--enable-feature=new-ui`

scripts/ui_release.sh

@@ -30,8 +30,8 @@ function publish() {
     cmd+=" --dry-run"
   fi
   for workspace in ${workspaces}; do
-    # package "app" is private so we shouldn't try to publish it.
-    if [[ "${workspace}" != "react-app" ]]; then
+    # package "mantine-ui" is private so we shouldn't try to publish it.
+    if [[ "${workspace}" != "mantine-ui" ]]; then
       cd "${workspace}"
       eval "${cmd}"
       cd "${root_ui_folder}"

web/ui/build_ui.sh

@@ -30,10 +30,19 @@ function buildModule() {
 }
 
 function buildReactApp() {
+  echo "build react-app"
+  cd react-app
+  npm run build
+  cd ..
+  rm -rf ./static/react-app
+  mv ./react-app/build ./static/react-app
+}
+
+function buildMantineUI() {
   echo "build mantine-ui"
   npm run build -w @prometheus-io/mantine-ui
-  rm -rf ./static/react
-  mv ./mantine-ui/dist ./static/react
+  rm -rf ./static/mantine-ui
+  mv ./mantine-ui/dist ./static/mantine-ui
 }
 
 for i in "$@"; do
@@ -41,6 +50,7 @@ for i in "$@"; do
   --all)
     buildModule
     buildReactApp
+    buildMantineUI
     shift
     ;;
   --build-module)

web/ui/mantine-ui/index.html

@@ -2,7 +2,7 @@
 <html lang="en">
   <head>
     <meta charset="UTF-8" />
-    <link rel="icon" type="image/svg+xml" href="/prometheus-logo.svg" />
+    <link rel="icon" type="image/svg+xml" href="/favicon.svg" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
 
     <!--

web/ui/module/codemirror-promql/package.json

@@ -41,6 +41,7 @@
     "@lezer/common": "^1.1.1",
     "@lezer/highlight": "^1.2.0",
     "@lezer/lr": "^1.3.14",
+    "eslint-plugin-prettier": "^5.1.3",
     "isomorphic-fetch": "^3.0.0",
     "nock": "^13.4.0"
   },

web/ui/react-app/package.json

@@ -1,5 +1,5 @@
 {
-  "name": "@prometheus-io/app",
+  "name": "@prometheus-io/react-app",
   "version": "0.49.1",
   "private": true,
   "dependencies": {
@@ -68,7 +68,9 @@
     "@testing-library/react-hooks": "^7.0.2",
     "@types/enzyme": "^3.10.18",
     "@types/flot": "0.0.36",
+    "@types/jest": "^29.5.11",
     "@types/jquery": "^3.5.29",
+    "@types/node": "^20.10.4",
     "@types/react": "^17.0.71",
     "@types/react-copy-to-clipboard": "^5.0.7",
     "@types/react-dom": "^17.0.25",
@@ -78,8 +80,16 @@
     "@wojtekmaj/enzyme-adapter-react-17": "^0.8.0",
     "enzyme": "^3.11.0",
     "enzyme-to-json": "^3.6.2",
+    "eslint-config-prettier": "^8.10.0",
+    "eslint-config-react-app": "^7.0.1",
+    "eslint-plugin-prettier": "^4.2.1",
+    "jest-canvas-mock": "^2.5.2",
+    "jest-fetch-mock": "^3.0.3",
     "mutationobserver-shim": "^0.3.7",
-    "sinon": "^14.0.2"
+    "prettier": "^2.8.8",
+    "react-scripts": "^5.0.1",
+    "sinon": "^14.0.2",
+    "ts-jest": "^29.1.1"
   },
   "jest": {
     "snapshotSerializers": [

web/web.go

@@ -81,6 +81,7 @@ var reactRouterAgentPaths = []string{
 // Paths that are handled by the React router when the Agent mode is not set.
 var reactRouterServerPaths = []string{
 	"/alerts",
+	"/graph",
 	"/query",
 	"/rules",
 	"/tsdb-status",
@@ -251,6 +252,7 @@ type Options struct {
 	UserAssetsPath             string
 	ConsoleTemplatesPath       string
 	ConsoleLibrariesPath       string
+	UseNewUI                   bool
 	EnableLifecycle            bool
 	EnableAdminAPI             bool
 	PageTitle                  string
@@ -361,10 +363,13 @@ func New(logger log.Logger, o *Options) *Handler {
 		router = router.WithPrefix(o.RoutePrefix)
 	}
 
-	homePage := "/query"
+	homePage := "/graph"
 	if o.IsAgent {
 		homePage = "/agent"
 	}
+	if o.UseNewUI {
+		homePage = "/query"
+	}
 
 	readyf := h.testReady
 
@@ -372,6 +377,11 @@ func New(logger log.Logger, o *Options) *Handler {
 		http.Redirect(w, r, path.Join(o.ExternalURL.Path, homePage), http.StatusFound)
 	})
 
+	reactAssetsRoot := "/static/react-app"
+	if h.options.UseNewUI {
+		reactAssetsRoot = "/static/mantine-ui"
+	}
+
 	// The console library examples at 'console_libraries/prom.lib' still depend on old asset files being served under `classic`.
 	router.Get("/classic/static/*filepath", func(w http.ResponseWriter, r *http.Request) {
 		r.URL.Path = path.Join("/static", route.Param(r.Context(), "filepath"))
@@ -389,7 +399,8 @@ func New(logger log.Logger, o *Options) *Handler {
 	router.Get("/consoles/*filepath", readyf(h.consoles))
 
 	serveReactApp := func(w http.ResponseWriter, r *http.Request) {
-		f, err := ui.Assets.Open("/static/react/index.html")
+		indexPath := reactAssetsRoot + "/index.html"
+		f, err := ui.Assets.Open(indexPath)
 		if err != nil {
 			w.WriteHeader(http.StatusInternalServerError)
 			fmt.Fprintf(w, "Error opening React index.html: %v", err)
@@ -426,8 +437,8 @@ func New(logger log.Logger, o *Options) *Handler {
 
 	// The favicon and manifest are bundled as part of the React app, but we want to serve
 	// them on the root.
-	for _, p := range []string{"/favicon.ico", "/manifest.json"} {
-		assetPath := "/static/react" + p
+	for _, p := range []string{"/favicon.svg", "/favicon.ico", "/manifest.json"} {
+		assetPath := reactAssetsRoot + p
 		router.Get(p, func(w http.ResponseWriter, r *http.Request) {
 			r.URL.Path = assetPath
 			fs := server.StaticFileServer(ui.Assets)
@@ -435,9 +446,13 @@ func New(logger log.Logger, o *Options) *Handler {
 		})
 	}
 
+	reactStaticAssetsDir := "/static"
+	if h.options.UseNewUI {
+		reactStaticAssetsDir = "/assets"
+	}
 	// Static files required by the React app.
-	router.Get("/assets/*filepath", func(w http.ResponseWriter, r *http.Request) {
-		r.URL.Path = path.Join("/static/react/assets", route.Param(r.Context(), "filepath"))
+	router.Get(reactStaticAssetsDir+"/*filepath", func(w http.ResponseWriter, r *http.Request) {
+		r.URL.Path = path.Join(reactAssetsRoot+reactStaticAssetsDir, route.Param(r.Context(), "filepath"))
 		fs := server.StaticFileServer(ui.Assets)
 		fs.ServeHTTP(w, r)
 	})