dashboard, p2p, vendor: visualize peers (#19247)

* dashboard, p2p: visualize peers

* dashboard: change scale to green to red

dashboard/assets/webpack.config.dev.js

@@ -0,0 +1,35 @@
+// Copyright 2018 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+const webpack = require('webpack');
+const merge = require('webpack-merge');
+const WebpackDashboard = require('webpack-dashboard/plugin');
+const common = require('./webpack.config.common.js');
+
+module.exports = merge(common, {
+	mode:    'development',
+	plugins: [
+		new WebpackDashboard(),
+		new webpack.HotModuleReplacementPlugin(),
+	],
+	// devtool:   'eval',
+	devtool:   'source-map',
+	devServer: {
+		port:     8081,
+		hot:      true,
+		compress: true,
+	},
+});