diff --git a/README.md b/README.md
index 51ddcb6..d13cd2c 100644
--- a/README.md
+++ b/README.md
@@ -90,3 +90,16 @@ Some important environment variables are :
 ## Troubleshooting
 
 If you experience an issue or want to propose a new feature in WBO, please [open a github issue](https://github.com/lovasoa/whitebophir/issues/new).
+
+## Monitoring
+
+If you are self-hosting a WBO instance, you may want to monitor its load,
+the number of connected users, and different metrics.
+
+You can start WBO with the `STATSD_URL` to send it to a statsd-compatible
+metrics collection agent.
+
+Example: `docker run -e STATSD_URL=udp://127.0.0.1:8125 lovasoa/wbo`.
+
+ - If you use **prometheus**, you can collect the metrics with [statsd-exporter](https://hub.docker.com/r/prom/statsd-exporter).
+ - If you use **datadog**, you can collect the metrics with [dogstatsd](https://docs.datadoghq.com/developers/dogstatsd).
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
index 50925a9..203150e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,3289 +1,3294 @@
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+      "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A=="
+    },
+    "yargs": {
+      "version": "13.3.2",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.3.2.tgz",
+      "integrity": "sha512-AX3Zw5iPruN5ie6xGRIDgqkT+ZhnRlZMLMHAs8tg7nRruy2Nb+i5o9bwghAogtM08q1dpr2LVoS8KSTMYpWXUw==",
+      "dev": true,
+      "requires": {
+        "cliui": "^5.0.0",
+        "find-up": "^3.0.0",
+        "get-caller-file": "^2.0.1",
+        "require-directory": "^2.1.1",
+        "require-main-filename": "^2.0.0",
+        "set-blocking": "^2.0.0",
+        "string-width": "^3.0.0",
+        "which-module": "^2.0.0",
+        "y18n": "^4.0.0",
+        "yargs-parser": "^13.1.2"
+      },
+      "dependencies": {
+        "ansi-regex": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
+          "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
+          "dev": true
+        },
+        "string-width": {
+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
+          "integrity": "sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==",
+          "dev": true,
+          "requires": {
+            "emoji-regex": "^7.0.1",
+            "is-fullwidth-code-point": "^2.0.0",
+            "strip-ansi": "^5.1.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "5.2.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
+          "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^4.1.0"
+          }
+        }
+      }
+    },
+    "yargs-parser": {
+      "version": "13.1.2",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.2.tgz",
+      "integrity": "sha512-3lbsNRf/j+A4QuSZfDRA7HRSfWrzO0YjqTJd5kjAq37Zep1CEgaYmrH9Q3GwPiB9cHyd1Y1UwggGhJGoxipbzg==",
+      "dev": true,
+      "requires": {
+        "camelcase": "^5.0.0",
+        "decamelize": "^1.2.0"
+      }
+    },
+    "yargs-unparser": {
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/yargs-unparser/-/yargs-unparser-1.6.0.tgz",
+      "integrity": "sha512-W9tKgmSn0DpSatfri0nx52Joq5hVXgeLiqR/5G0sZNDoLZFOr/xjBUDcShCOGNsBnEMNo1KAMBkTej1Hm62HTw==",
+      "dev": true,
+      "requires": {
+        "flat": "^4.1.0",
+        "lodash": "^4.17.15",
+        "yargs": "^13.3.0"
+      }
+    }
+  }
 }
diff --git a/package.json b/package.json
index 55382dc..3c5f843 100644
--- a/package.json
+++ b/package.json
@@ -11,9 +11,10 @@
     "accept-language-parser": "^1.5.0",
     "async-mutex": "^0.3.1",
     "handlebars": "^4.7.7",
-    "polyfill-library": "^3.104.0",
+    "polyfill-library": "^3.105.0",
     "serve-static": "^1.14.1",
-    "socket.io": "^3.1.2"
+    "socket.io": "^3.1.2",
+    "statsd-client": "^0.4.7"
   },
   "scripts": {
     "start": "node ./server/server.js",
@@ -26,6 +27,6 @@
   },
   "devDependencies": {
     "geckodriver": "^1.22.3",
-    "nightwatch": "^1.6.3"
+    "nightwatch": "^1.6.4"
   }
 }
diff --git a/server/boardData.js b/server/boardData.js
index d7867cc..0f4b28b 100644
--- a/server/boardData.js
+++ b/server/boardData.js
@@ -215,7 +215,7 @@ class BoardData {
       // empty board
       try {
         await fs.promises.unlink(file);
-        log("removed empty board", { name: this.name });
+        log("removed empty board", { board: this.name });
       } catch (err) {
         if (err.code !== "ENOENT") {
           // If the file already wasn't saved, this is not an error
@@ -227,12 +227,13 @@ class BoardData {
         await fs.promises.writeFile(tmp_file, board_txt, { flag: "wx" });
         await fs.promises.rename(tmp_file, file);
         log("saved board", {
-          name: this.name,
+          board: this.name,
           size: board_txt.length,
           delay_ms: Date.now() - this.lastSaveDate,
         });
       } catch (err) {
         log("board saving error", {
+          board: this.name,
           err: err.toString(),
           tmp_file: tmp_file,
         });
diff --git a/server/configuration.js b/server/configuration.js
index 334663c..6872421 100644
--- a/server/configuration.js
+++ b/server/configuration.js
@@ -47,5 +47,11 @@ module.exports = {
 
   /** Automatically switch to White-out on finger touch after drawing
       with Pencil using a stylus. Only supported on iPad with Apple Pencil. */
-  AUTO_FINGER_WHITEOUT: process.env['AUTO_FINGER_WHITEOUT'] !== "disabled",
+  AUTO_FINGER_WHITEOUT: process.env["AUTO_FINGER_WHITEOUT"] !== "disabled",
+
+  /** If this variable is set, it should point to a statsd listener that will 
+   * receive WBO's monitoring information.
+   * example: udp://127.0.0.1
+  */
+  STATSD_URL: process.env["STATSD_URL"],
 };
diff --git a/server/log.js b/server/log.js
index d172bb8..963ad05 100644
--- a/server/log.js
+++ b/server/log.js
@@ -1,3 +1,40 @@
+const config = require("./configuration.js"),
+  SDC = require("statsd-client");
+
+/**
+ * Parse a statsd connection string
+ * @param {string} url
+ * @returns {SDC.TcpOptions|SDC.UdpOptions}
+ */
+function parse_statsd_url(url) {
+  const regex = /^(tcp|udp|statsd):\/\/(.*):(\d+)$/;
+  const match = url.match(regex);
+  if (!match)
+    throw new Error("Invalid statsd connection string, doesn't match " + regex);
+  const [_, protocol, host, port_str] = match;
+  const tcp = protocol !== "udp";
+  const port = parseInt(port_str);
+  return { tcp, host, port, prefix: "wbo" };
+}
+
+/**
+ * Statsd client to which metrics will be reported
+ * @type {SDC | null}
+ * */
+let statsd = null;
+
+if (config.STATSD_URL) {
+  const options = parse_statsd_url(config.STATSD_URL);
+  console.log("Exposing metrics on statsd server: " + JSON.stringify(options));
+  statsd = new SDC(options);
+}
+
+if (statsd) {
+  setInterval(function reportHealth(){
+    statsd.gauge('memory', process.memoryUsage().heapUsed);
+  }, 1000);
+}
+
 /**
  * Add a message to the logs
  * @param {string} type
@@ -6,7 +43,33 @@
 function log(type, infos) {
   var msg = type;
   if (infos) msg += "\t" + JSON.stringify(infos);
+  if (statsd) {
+    const tags = {};
+    if (infos.board) tags.board = infos.board;
+    if (infos.original_ip) tags.original_ip = infos.original_ip;
+    statsd.increment(type, 1, tags);
+  }
   console.log(msg);
 }
 
-module.exports.log = log;
+/**
+ * @template {(...args) => any} F
+ * @param {F} f
+ * @returns {F}
+ */
+function monitorFunction(f) {
+  if (statsd) return statsd.helpers.wrapCallback(f.name, f);
+  else return f;
+}
+
+/**
+ * Report a number
+ * @param {string} name 
+ * @param {number} value 
+ * @param {{[name:string]: string}=} tags
+ */
+function gauge(name, value, tags){
+  if (statsd) statsd.gauge(name, value, tags);
+}
+
+module.exports = { log, gauge, monitorFunction };
diff --git a/server/server.js b/server/server.js
index f3bc1f1..db7a20b 100644
--- a/server/server.js
+++ b/server/server.js
@@ -1,8 +1,7 @@
 var app = require("http").createServer(handler),
   sockets = require("./sockets.js"),
-  log = require("./log.js").log,
+  {log, monitorFunction} = require("./log.js"),
   path = require("path"),
-  url = require("url"),
   fs = require("fs"),
   crypto = require("crypto"),
   serveStatic = require("serve-static"),
@@ -57,7 +56,7 @@ function serveError(request, response) {
  */
 function logRequest(request) {
   log("connection", {
-    ip: request.connection.remoteAddress,
+    ip: request.socket.remoteAddress,
     original_ip:
       request.headers["x-forwarded-for"] || request.headers["forwarded"],
     user_agent: request.headers["user-agent"],
@@ -72,7 +71,7 @@ function logRequest(request) {
  */
 function handler(request, response) {
   try {
-    handleRequest(request, response);
+    handleRequestAndLog(request, response);
   } catch (err) {
     console.trace(err);
     response.writeHead(500, { "Content-Type": "text/plain" });
@@ -101,7 +100,7 @@ function validateBoardName(boardName) {
  * @type {import('http').RequestListener}
  */
 function handleRequest(request, response) {
-  var parsedUrl = url.parse(request.url, true);
+  var parsedUrl = new URL(request.url, 'http://wbo/');
   var parts = parsedUrl.pathname.split("/");
   if (parts[0] === "") parts.shift();
 
@@ -110,7 +109,7 @@ function handleRequest(request, response) {
       // "boards" refers to the root directory
       if (parts.length === 1) {
         // '/boards?board=...' This allows html forms to point to boards
-        var boardName = parsedUrl.query.board || "anonymous";
+        var boardName = parsedUrl.searchParams.get("board") || "anonymous";
         var headers = { Location: "boards/" + encodeURIComponent(boardName) };
         response.writeHead(301, headers);
         response.end();
@@ -218,4 +217,5 @@ function handleRequest(request, response) {
   }
 }
 
+const handleRequestAndLog = monitorFunction(handleRequest);
 module.exports = app;
diff --git a/server/sockets.js b/server/sockets.js
index be12ab8..cb0dd25 100644
--- a/server/sockets.js
+++ b/server/sockets.js
@@ -1,5 +1,5 @@
 var iolib = require("socket.io"),
-  log = require("./log.js").log,
+  { log, gauge, monitorFunction } = require("./log.js"),
   BoardData = require("./boardData.js").BoardData,
   config = require("./configuration");
 
@@ -17,9 +17,10 @@ var boards = {};
  * @returns {A}
  */
 function noFail(fn) {
+  const monitored = monitorFunction(fn);
   return function noFailWrapped(arg) {
     try {
-      return fn(arg);
+      return monitored(arg);
     } catch (e) {
       console.trace(e);
     }
@@ -28,7 +29,7 @@ function noFail(fn) {
 
 function startIO(app) {
   io = iolib(app);
-  io.on("connection", noFail(socketConnection));
+  io.on("connection", noFail(handleSocketConnection));
   return io;
 }
 
@@ -41,6 +42,7 @@ function getBoard(name) {
   } else {
     var board = BoardData.load(name);
     boards[name] = board;
+    gauge("boards in memory", Object.keys(boards).length);
     return board;
   }
 }
@@ -49,7 +51,7 @@ function getBoard(name) {
  * Executes on every new connection
  * @param {iolib.Socket} socket
  */
-function socketConnection(socket) {
+function handleSocketConnection(socket) {
   /**
    * Function to call when an user joins a board
    * @param {string} name
@@ -64,6 +66,7 @@ function socketConnection(socket) {
     var board = await getBoard(name);
     board.users.add(socket.id);
     log("board joined", { board: board.name, users: board.users.size });
+    gauge("connected", board.users.size, {board: name});
     return board;
   }
 
@@ -141,9 +144,11 @@ function socketConnection(socket) {
         board.users.delete(socket.id);
         var userCount = board.users.size;
         log("disconnection", { board: board.name, users: board.users.size });
+        gauge("connected", userCount, { board: board.name });
         if (userCount === 0) {
           board.save();
           delete boards[room];
+          gauge("boards in memory", Object.keys(boards).length);
         }
       }
     });