diff --git a/vscode-dotty/package-lock.json b/vscode-dotty/package-lock.json
index 3c0d58df9fb6..e54e2b39028a 100644
--- a/vscode-dotty/package-lock.json
+++ b/vscode-dotty/package-lock.json
@@ -4,12 +4,59 @@
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       "requires": {
         "safe-buffer": "~5.1.0"
       }
     },
-    "stringstream": {
-      "version": "0.0.6",
-      "resolved": "https://registry.npmjs.org/stringstream/-/stringstream-0.0.6.tgz",
-      "integrity": "sha512-87GEBAkegbBcweToUrdzf3eLhWNg06FJTebl4BVJz/JgWy8CvEr9dRtX5qWphiynMSQlxxi+QqN0z5T32SLlhA==",
-      "dev": true
-    },
     "strip-bom": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/strip-bom/-/strip-bom-2.0.0.tgz",
@@ -1896,6 +2029,20 @@
         "inherits": "2"
       }
     },
+    "tar-stream": {
+      "version": "1.6.2",
+      "resolved": "https://registry.npmjs.org/tar-stream/-/tar-stream-1.6.2.tgz",
+      "integrity": "sha512-rzS0heiNf8Xn7/mpdSVVSMAWAoy9bfb1WOTYC78Z0UQKeKa/CWS8FOq0lKGNa8DWKAn9gxjCvMLYc5PGXYlK2A==",
+      "requires": {
+        "bl": "^1.0.0",
+        "buffer-alloc": "^1.2.0",
+        "end-of-stream": "^1.0.0",
+        "fs-constants": "^1.0.0",
+        "readable-stream": "^2.3.0",
+        "to-buffer": "^1.1.1",
+        "xtend": "^4.0.0"
+      }
+    },
     "through": {
       "version": "2.3.8",
       "resolved": "https://registry.npmjs.org/through/-/through-2.3.8.tgz",
@@ -1942,12 +2089,32 @@
         }
       }
     },
+    "to-buffer": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/to-buffer/-/to-buffer-1.1.1.tgz",
+      "integrity": "sha512-lx9B5iv7msuFYE3dytT+KE5tap+rNYw+K4jVkb9R/asAb+pbBSM17jtunHplhBe6RRJdZx3Pn2Jph24O32mOVg=="
+    },
+    "tough-cookie": {
+      "version": "2.4.3",
+      "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-2.4.3.tgz",
+      "integrity": "sha512-Q5srk/4vDM54WJsJio3XNn6K2sCG+CQ8G5Wz6bZhRZoAe/+TxjWB/GlFAnYEbkYVlON9FMk/fE3h2RLpPXo4lQ==",
+      "requires": {
+        "psl": "^1.1.24",
+        "punycode": "^1.4.1"
+      }
+    },
+    "tunnel-agent": {
+      "version": "0.6.0",
+      "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
+      "integrity": "sha1-J6XeoGs2sEoKmWZ3SykIaPD8QP0=",
+      "requires": {
+        "safe-buffer": "^5.0.1"
+      }
+    },
     "tweetnacl": {
       "version": "0.14.5",
       "resolved": "https://registry.npmjs.org/tweetnacl/-/tweetnacl-0.14.5.tgz",
-      "integrity": "sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q=",
-      "dev": true,
-      "optional": true
+      "integrity": "sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q="
     },
     "typescript": {
       "version": "2.9.2",
@@ -1978,14 +2145,12 @@
     "util-deprecate": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
-      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
-      "dev": true
+      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8="
     },
     "uuid": {
       "version": "3.3.2",
       "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.2.tgz",
-      "integrity": "sha512-yXJmeNaw3DnnKAOKJE51sL/ZaYfWJRl1pK9dr19YFCu0ObS231AB1/LbqTKRAQ5kw8A90rA6fr4riOUpTZvQZA==",
-      "dev": true
+      "integrity": "sha512-yXJmeNaw3DnnKAOKJE51sL/ZaYfWJRl1pK9dr19YFCu0ObS231AB1/LbqTKRAQ5kw8A90rA6fr4riOUpTZvQZA=="
     },
     "vali-date": {
       "version": "1.0.0",
@@ -1997,19 +2162,10 @@
       "version": "1.10.0",
       "resolved": "https://registry.npmjs.org/verror/-/verror-1.10.0.tgz",
       "integrity": "sha1-OhBcoXBTr1XW4nDB+CiGguGNpAA=",
-      "dev": true,
       "requires": {
         "assert-plus": "^1.0.0",
         "core-util-is": "1.0.2",
         "extsprintf": "^1.2.0"
-      },
-      "dependencies": {
-        "assert-plus": {
-          "version": "1.0.0",
-          "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-1.0.0.tgz",
-          "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU=",
-          "dev": true
-        }
       }
     },
     "vinyl": {
@@ -2102,44 +2258,6 @@
         "source-map-support": "^0.5.0",
         "url-parse": "^1.4.3",
         "vinyl-source-stream": "^1.1.0"
-      },
-      "dependencies": {
-        "clone": {
-          "version": "1.0.4",
-          "resolved": "https://registry.npmjs.org/clone/-/clone-1.0.4.tgz",
-          "integrity": "sha1-2jCcwmPfFZlMaIypAheco8fNfH4=",
-          "dev": true
-        },
-        "gulp-untar": {
-          "version": "0.0.7",
-          "resolved": "https://registry.npmjs.org/gulp-untar/-/gulp-untar-0.0.7.tgz",
-          "integrity": "sha512-0QfbCH2a1k2qkTLWPqTX+QO4qNsHn3kC546YhAP3/n0h+nvtyGITDuDrYBMDZeW4WnFijmkOvBWa5HshTic1tw==",
-          "dev": true,
-          "requires": {
-            "event-stream": "~3.3.4",
-            "streamifier": "~0.1.1",
-            "tar": "^2.2.1",
-            "through2": "~2.0.3",
-            "vinyl": "^1.2.0"
-          }
-        },
-        "replace-ext": {
-          "version": "0.0.1",
-          "resolved": "https://registry.npmjs.org/replace-ext/-/replace-ext-0.0.1.tgz",
-          "integrity": "sha1-KbvZIHinOfC8zitO5B6DeVNSKSQ=",
-          "dev": true
-        },
-        "vinyl": {
-          "version": "1.2.0",
-          "resolved": "https://registry.npmjs.org/vinyl/-/vinyl-1.2.0.tgz",
-          "integrity": "sha1-XIgDbPVl5d8FVYv8kR+GVt8hiIQ=",
-          "dev": true,
-          "requires": {
-            "clone": "^1.0.0",
-            "clone-stats": "^0.0.1",
-            "replace-ext": "0.0.1"
-          }
-        }
       }
     },
     "vscode-jsonrpc": {
@@ -2148,9 +2266,9 @@
       "integrity": "sha512-perEnXQdQOJMTDFNv+UF3h1Y0z4iSiaN9jIlb0OqIYgosPCZGYh/MCUlkFtV2668PL69lRDO32hmvL2yiidUYg=="
     },
     "vscode-languageclient": {
-      "version": "5.1.0",
-      "resolved": "https://registry.npmjs.org/vscode-languageclient/-/vscode-languageclient-5.1.0.tgz",
-      "integrity": "sha512-Z95Kps8UqD4o17HE3uCkZuvenOsxHVH46dKmaGVpGixEFZigPaVuVxLM/JWeIY9aRenoC0ZD9CK1O7L4jpffKg==",
+      "version": "5.1.1",
+      "resolved": "https://registry.npmjs.org/vscode-languageclient/-/vscode-languageclient-5.1.1.tgz",
+      "integrity": "sha512-jMxshi+BPRQFNG8GB00dJv7ldqMda0be26laYYll/udtJuHbog6RqK10GSxHWDN0PgY0b0m5fePyTk3bq8a0TA==",
       "requires": {
         "semver": "^5.5.0",
         "vscode-languageserver-protocol": "3.13.0"
@@ -2163,17 +2281,6 @@
       "requires": {
         "vscode-languageserver-protocol": "3.13.0",
         "vscode-uri": "^1.0.6"
-      },
-      "dependencies": {
-        "vscode-languageserver-protocol": {
-          "version": "3.13.0",
-          "resolved": "https://registry.npmjs.org/vscode-languageserver-protocol/-/vscode-languageserver-protocol-3.13.0.tgz",
-          "integrity": "sha512-2ZGKwI+P2ovQll2PGAp+2UfJH+FK9eait86VBUdkPd9HRlm8e58aYT9pV/NYanHOcp3pL6x2yTLVCFMcTer0mg==",
-          "requires": {
-            "vscode-jsonrpc": "^4.0.0",
-            "vscode-languageserver-types": "3.13.0"
-          }
-        }
       }
     },
     "vscode-languageserver-protocol": {
@@ -2198,14 +2305,20 @@
     "wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
-      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
-      "dev": true
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
+    },
+    "ws": {
+      "version": "6.1.0",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-6.1.0.tgz",
+      "integrity": "sha512-H3dGVdGvW2H8bnYpIDc3u3LH8Wue3Qh+Zto6aXXFzvESkTVT6rAfKR6tR/+coaUvxs8yHtmNV0uioBF62ZGSTg==",
+      "requires": {
+        "async-limiter": "~1.0.0"
+      }
     },
     "xtend": {
       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
-      "integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68=",
-      "dev": true
+      "integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68="
     },
     "yauzl": {
       "version": "2.10.0",
@@ -2225,6 +2338,16 @@
       "requires": {
         "buffer-crc32": "~0.2.3"
       }
+    },
+    "zip-stream": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/zip-stream/-/zip-stream-2.0.1.tgz",
+      "integrity": "sha512-c+eUhhkDpaK87G/py74wvWLtz2kzMPNCCkUApkun50ssE0oQliIQzWpTnwjB+MTKVIf2tGzIgHyqW/Y+W77ecQ==",
+      "requires": {
+        "archiver-utils": "^2.0.0",
+        "compress-commons": "^1.2.0",
+        "readable-stream": "^2.0.0"
+      }
     }
   }
 }
diff --git a/vscode-dotty/package.json b/vscode-dotty/package.json
index 3d76a617f466..fe5532031eb5 100644
--- a/vscode-dotty/package.json
+++ b/vscode-dotty/package.json
@@ -11,7 +11,7 @@
   },
   "icon": "images/dotty-logo.png",
   "engines": {
-    "vscode": "^1.27.0"
+    "vscode": "^1.27.1"
   },
   "categories": [
     "Languages"
@@ -48,6 +48,29 @@
           "type": "boolean",
           "default": true,
           "description": "If true, saving a worksheet will also run it."
+        },
+        "dotty.trace.remoteWorkspaceDumpUrl": {
+          "type": "string",
+          "default": "",
+          "description": "Url to send local workspace dump to."
+        },
+        "dotty.trace.remoteTracingUrl": {
+          "type": "string",
+          "default": "",
+          "description": "Url to send local LSP communication to."
+        },
+        "dotty.trace.machineId": {
+          "type": [
+            "string",
+            "null"
+          ],
+          "default": null,
+          "description": "ID of your machine used when Dotty Language Server tracing is turned on."
+        },
+        "dotty.trace.maximumMessageSize": {
+          "type": "number",
+          "default": 512,
+          "description": "Maximum size for the messages sent to remote server. Larger ones will be split."
         }
       }
     },
@@ -88,12 +111,18 @@
     "compare-versions": "^3.4.0",
     "vscode-languageclient": "^5.1.0",
     "vscode-languageserver": "^5.1.0",
-    "vscode-jsonrpc": "4.0.0"
+    "vscode-jsonrpc": "4.0.0",
+    "ws": "^6.0.0",
+    "archiver": "^3.0.0",
+    "request": "^2.88.0"
   },
   "devDependencies": {
     "@types/compare-versions": "^3.0.0",
     "@types/mocha": "^5.2.5",
     "@types/node": "^8.10.32",
+    "@types/ws": "^6.0.0",
+    "@types/archiver": "^2.1.2",
+    "@types/request": "^2.47.1",
     "typescript": "^2.9.2",
     "vscode": "^1.1.21"
   }
diff --git a/vscode-dotty/src/compat.ts b/vscode-dotty/src/compat.ts
index 1d11e4236f24..ae170b9090db 100644
--- a/vscode-dotty/src/compat.ts
+++ b/vscode-dotty/src/compat.ts
@@ -1,8 +1,8 @@
-import * as vscode from 'vscode';
+import * as vscode from 'vscode'
 
-import { HoverRequest } from 'vscode-languageclient';
+import { HoverRequest } from 'vscode-languageclient'
 import { MarkedString, LanguageClient, LanguageClientOptions, RevealOutputChannelOn,
-         ServerOptions } from 'vscode-languageclient';
+         ServerOptions } from 'vscode-languageclient'
 
 // Fix hover functionality when using this version of vscode-dotty with Dotty
 // Language Server 0.9 or earlier.
diff --git a/vscode-dotty/src/extension.ts b/vscode-dotty/src/extension.ts
index 4c42966243cc..282cbe4e39fa 100644
--- a/vscode-dotty/src/extension.ts
+++ b/vscode-dotty/src/extension.ts
@@ -1,17 +1,15 @@
-'use strict';
+import * as fs from 'fs'
+import * as path from 'path'
 
-import * as fs from 'fs';
-import * as path from 'path';
+import * as pcp from 'promisify-child-process'
+import * as compareVersions from 'compare-versions'
 
-import * as pcp from 'promisify-child-process';
-import * as compareVersions from 'compare-versions';
+import { ChildProcess } from "child_process"
 
-import { ChildProcess } from "child_process";
-
-import { ExtensionContext } from 'vscode';
-import * as vscode from 'vscode';
+import { ExtensionContext } from 'vscode'
+import * as vscode from 'vscode'
 import { LanguageClient, LanguageClientOptions, RevealOutputChannelOn,
-         ServerOptions } from 'vscode-languageclient';
+         ServerOptions } from 'vscode-languageclient'
 import { enableOldServerWorkaround } from './compat'
 import * as features from './features'
 
@@ -19,9 +17,14 @@ export let client: LanguageClient
 
 import * as rpc from 'vscode-jsonrpc'
 import * as sbtserver from './sbt-server'
+import { Tracer } from './tracer'
+
+export const extensionName = 'dotty'
+const extensionConfig = vscode.workspace.getConfiguration(extensionName)
 
 let extensionContext: ExtensionContext
 let outputChannel: vscode.OutputChannel
+let tracer: Tracer
 
 /** The sbt process that may have been started by this extension */
 let sbtProcess: ChildProcess | undefined
@@ -45,9 +48,14 @@ function isConfiguredProject() {
 
 export function activate(context: ExtensionContext) {
   extensionContext = context
-  outputChannel = vscode.window.createOutputChannel("Dotty");
+  outputChannel = vscode.window.createOutputChannel("Dotty")
+  tracer = new Tracer({
+    extensionContext,
+    extensionConfig,
+    extensionOut: outputChannel,
+  })
 
-  const coursierPath = path.join(extensionContext.extensionPath, "out", "coursier");
+  const coursierPath = path.join(extensionContext.extensionPath, "out", "coursier")
   const dottyPluginSbtFileSource = path.join(extensionContext.extensionPath, "out", "dotty-plugin.sbt")
   const buildSbtFileSource = path.join(extensionContext.extensionPath, "out", "build.sbt")
 
@@ -297,6 +305,8 @@ function bootstrapSbtProject(buildSbtFileSource: string,
 }
 
 function run(serverOptions: ServerOptions, isOldServer: boolean) {
+  const lspOutputChannel = tracer.run()
+
   const clientOptions: LanguageClientOptions = {
     documentSelector: [
       { scheme: 'file', pattern: '**/*.sc' },
@@ -307,11 +317,11 @@ function run(serverOptions: ServerOptions, isOldServer: boolean) {
     synchronize: {
       configurationSection: 'dotty'
     },
-    outputChannel: outputChannel,
+    outputChannel: lspOutputChannel,
     revealOutputChannelOn: RevealOutputChannelOn.Never
   }
 
-  client = new LanguageClient("dotty", "Dotty", serverOptions, clientOptions)
+  client = new LanguageClient(extensionName, "Dotty", serverOptions, clientOptions)
   client.registerFeature(new features.WorksheetRunFeature(client))
 
   if (isOldServer)
diff --git a/vscode-dotty/src/features.ts b/vscode-dotty/src/features.ts
index 8416048aa86e..24d02c169978 100644
--- a/vscode-dotty/src/features.ts
+++ b/vscode-dotty/src/features.ts
@@ -14,9 +14,9 @@ import { WorksheetProvider } from './worksheet'
 // https://github.com/Microsoft/vscode-languageserver-node/issues/423 is fixed.
 function ensure<T, K extends keyof T>(target: T, key: K): T[K] {
   if (target[key] === void 0) {
-    target[key] = {} as any;
+    target[key] = {} as any
   }
-  return target[key];
+  return target[key]
 }
 
 export interface WorksheetClientCapabilities {
diff --git a/vscode-dotty/src/passthrough-server.ts b/vscode-dotty/src/passthrough-server.ts
index 6ac50f05fe92..7d3005fe71fe 100644
--- a/vscode-dotty/src/passthrough-server.ts
+++ b/vscode-dotty/src/passthrough-server.ts
@@ -1,6 +1,4 @@
-'use strict';
-
-import * as net from 'net';
+import * as net from 'net'
 
 let argv: string[] = process.argv.slice(2)
 const firstArg: string | undefined = argv.shift()
@@ -22,7 +20,7 @@ client.on('data', (data) => {
   process.stdout.write(data.toString())
 })
 process.stdin.on('readable', () => {
-  let chunk = process.stdin.read();
+  let chunk = process.stdin.read()
   if (chunk !== null) {
     if (isConnected) {
       client.write(chunk)
diff --git a/vscode-dotty/src/sbt-server.ts b/vscode-dotty/src/sbt-server.ts
index 087e6a88d8b1..279d70f8af6e 100644
--- a/vscode-dotty/src/sbt-server.ts
+++ b/vscode-dotty/src/sbt-server.ts
@@ -79,25 +79,25 @@ function connectSocket(socket: net.Socket): net.Socket {
   if (u.protocol == 'tcp:' && u.port) {
     socket.connect(+u.port, '127.0.0.1');
   } else if (u.protocol == 'local:' && u.hostname && os.platform() == 'win32') {
-    let pipePath = '\\\\.\\pipe\\' + u.hostname;
-    socket.connect(pipePath);
+    let pipePath = '\\\\.\\pipe\\' + u.hostname
+    socket.connect(pipePath)
   } else if (u.protocol == 'local:' && u.path) {
-    socket.connect(u.path);
+    socket.connect(u.path)
   } else {
-    throw 'Unknown protocol ' + u.protocol;
+    throw 'Unknown protocol ' + u.protocol
   }
-  return socket;
+  return socket
 }
 
 // the port file is hardcoded to a particular location relative to the build.
 function discoverUrl(): url.Url {
-  let pf = path.join(workspaceRoot, 'project', 'target', 'active.json');
-  let portfile = JSON.parse(fs.readFileSync(pf).toString());
-  return url.parse(portfile.uri);
+  let pf = path.join(workspaceRoot, 'project', 'target', 'active.json')
+  let portfile = JSON.parse(fs.readFileSync(pf).toString())
+  return url.parse(portfile.uri)
 }
 
 function delay(ms: number) {
-	return new Promise(resolve => setTimeout(resolve, ms));
+	return new Promise(resolve => setTimeout(resolve, ms))
 }
 
 async function waitForServer(): Promise<net.Socket> {
@@ -106,12 +106,12 @@ async function waitForServer(): Promise<net.Socket> {
     location: vscode.ProgressLocation.Window,
     title: "Connecting to sbt server..."
   }, async _ => {
-    let retries = 60;
+    let retries = 60
     while (!socket && retries > 0) {
       try { socket = connectSocket(new net.Socket()) }
       catch (e) {
-        retries--;
-        await delay(1000);
+        retries--
+        await delay(1000)
       }
     }
     if (socket) return Promise.resolve(socket)
diff --git a/vscode-dotty/src/tracer.ts b/vscode-dotty/src/tracer.ts
new file mode 100644
index 000000000000..1a4841001d27
--- /dev/null
+++ b/vscode-dotty/src/tracer.ts
@@ -0,0 +1,382 @@
+import * as vscode from 'vscode'
+
+import * as fs from 'fs'
+import * as path from 'path'
+
+import * as archiver from 'archiver'
+import * as WebSocket from 'ws'
+import * as request from 'request'
+
+import { extensionName } from './extension'
+import { TracingConsentCache } from './tracing-consent'
+
+const consentCommandName = `${extensionName}.adjust-consent`
+
+export interface Ctx {
+  readonly extensionContext: vscode.ExtensionContext,
+  readonly extensionConfig: vscode.WorkspaceConfiguration,
+  readonly extensionOut: vscode.OutputChannel
+}
+
+export class Tracer {
+    private readonly ctx: Ctx
+
+    private projectId: string
+    private machineId: string
+    private sessionId: string
+
+    private tracingConsent: TracingConsentCache
+
+    private readonly remoteTracingUrl: string | undefined
+    private readonly remoteWorkspaceDumpUrl: string | undefined
+    private readonly maximumMessageSize: number
+    private get isTracingEnabled(): boolean {
+        return Boolean(this.remoteWorkspaceDumpUrl || this.remoteTracingUrl)
+    }
+
+    constructor(ctx: Ctx) {
+        this.ctx = ctx
+
+        this.tracingConsent = new TracingConsentCache(ctx.extensionContext.workspaceState)
+
+        this.remoteWorkspaceDumpUrl = this.ctx.extensionConfig.get<string>('trace.remoteWorkspaceDumpUrl')
+        this.remoteTracingUrl = this.ctx.extensionConfig.get<string>('trace.remoteTracingUrl')
+        const maximumMessageSize = this.ctx.extensionConfig.get<number>('trace.maximumMessageSize')
+        this.maximumMessageSize = maximumMessageSize === undefined || maximumMessageSize < 0 ? 0 : maximumMessageSize | 0
+
+        this.machineId = (() => {
+            const machineIdKey = 'tracing.machineId'
+            function persisted(value: string): string {
+                ctx.extensionConfig.update(machineIdKey, value, vscode.ConfigurationTarget.Global)
+                return value
+            }
+
+            const machineId = ctx.extensionConfig.get<string | null>(machineIdKey)
+            if (machineId != null) return machineId
+
+            // vscode.env.machineId is a dummy value if telemetry is off - cannot be used
+            const vscodeMachineId = vscode.workspace.getConfiguration().get<string>('telemetry.machineId')
+            if (vscodeMachineId !== undefined) return persisted(vscodeMachineId)
+
+            function uuidv4() {
+                // https://stackoverflow.com/a/2117523
+                return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function (c) {
+                    var r = Math.random() * 16 | 0, v = c == 'x' ? r : (r & 0x3 | 0x8)
+                    return v.toString(16)
+                })
+            }
+
+            return persisted(uuidv4())
+        })()
+
+        this.projectId = vscode.workspace.name !== undefined ? vscode.workspace.name : 'no-project'
+        this.sessionId = new Date().toISOString()
+    }
+
+    run(): vscode.OutputChannel | undefined {
+        const consentCommandDisposable = vscode.commands.registerCommand(consentCommandName, () => this.askForTracingConsent())
+        if (this.isTracingEnabled && this.tracingConsent.get() === 'no-answer') this.askForTracingConsent()
+        this.initializeAsyncWorkspaceDump()
+
+        const lspOutputChannel = this.createLspOutputChannel()
+        const statusBarItem = this.createStatusBarItem()
+        for (const disposable of [consentCommandDisposable, lspOutputChannel, statusBarItem]) {
+            if (disposable) this.ctx.extensionContext.subscriptions.push(disposable)
+        }
+        return lspOutputChannel
+    }
+
+    private askForTracingConsent(): void {
+        vscode.window.showInformationMessage(
+            'To help us improve the Scala IDE support, we would like to collect ' +
+            'the content of every Scala file in your project and ' +
+            'every interaction with Scala files in the IDE, including keystrokes. ' +
+            'This data will be stored anonymously (we won\'t know your name) on servers at EPFL in Switzerland.',
+            'Allow', 'Deny',
+        ).then((value: string | undefined) => {
+            if (value === 'Allow' || value === 'Deny') this.tracingConsent.set(value)
+        })
+    }
+
+    private initializeAsyncWorkspaceDump() {
+        const url = this.remoteWorkspaceDumpUrl
+        if (url === undefined) return
+
+        const doInitialize = () => {
+            try {
+                this.asyncUploadWorkspaceDump(url)
+            } catch (err) {
+                this.logError('error during workspace dump', safeError(err))
+            }
+        }
+
+        if (this.tracingConsent.get() === 'Allow') {
+            doInitialize()
+        } else {
+            let didInitialize = false
+            this.tracingConsent.subscribe(() => {
+                if (didInitialize) return
+                didInitialize = true
+                doInitialize()
+            })
+        }
+    }
+
+    private createStatusBarItem(): vscode.StatusBarItem | undefined {
+        if (!this.isTracingEnabled) return undefined
+        const item = vscode.window.createStatusBarItem(vscode.StatusBarAlignment.Left, 0)
+        item.command = consentCommandName
+        const renderStatusBarItem = () => {
+            item.text = (() => {
+                const desc = this.tracingConsent.get() === 'Allow' ? 'On' : 'Off'
+                return `$(radio-tower) Scala telemetry: ${desc}`
+            })()
+
+            item.tooltip = (() => {
+                const desc = this.tracingConsent.get() === 'Allow' ? 'enabled' : 'disabled'
+                const toggle = this.tracingConsent.get() === 'Allow' ? 'disable' : 'enable'
+                return `Data collection for Scala is ${desc}. ` +
+                    `Click to ${toggle} it.`
+            })()
+        }
+        renderStatusBarItem()
+        this.tracingConsent.subscribe(renderStatusBarItem)
+        item.show()
+        return item
+    }
+
+    private createLspOutputChannel(): vscode.OutputChannel | undefined {
+        if (this.ctx.extensionConfig.get('trace.server') === undefined) {
+            if (this.remoteTracingUrl) this.ctx.extensionOut.appendLine(
+                'error: tracing URL is set, but trace.server not - no remote tracing possible.'
+            )
+            return undefined
+        }
+
+        const lspOutputChannel = vscode.window.createOutputChannel('Dotty LSP Communication')
+        if (!this.remoteTracingUrl) return lspOutputChannel
+        try {
+            return this.createRemoteLspOutputChannel(this.remoteTracingUrl, lspOutputChannel)
+        } catch (err) {
+            this.logError('error during remote output channel creation', safeError(err))
+            return lspOutputChannel
+        }
+    }
+
+    private asyncUploadWorkspaceDump(url: string) {
+        const storagePath = this.ctx.extensionContext.storagePath
+        // TODO: handle multi-root workspaces
+        const rootPath = vscode.workspace.rootPath
+        if (storagePath === undefined || rootPath === undefined) {
+            this.logError('Cannot start workspace dump b/c of workspace state:', { storagePath, rootPath })
+            return
+        }
+
+        if (!fs.existsSync(storagePath)) fs.mkdirSync(storagePath)
+        const outputPath = path.join(storagePath, 'workspace-dump.zip')
+        if (fs.existsSync(outputPath)) fs.unlinkSync(outputPath)
+        const output = fs.createWriteStream(outputPath)
+
+        const zip = archiver('zip')
+        zip.on('error', (err) => this.logError('zip error', safeError(err)))
+        zip.on('warning', (err) => this.logError('zip warning', safeError(err)))
+        zip.on('finish', () => {
+            this.ctx.extensionOut.appendLine('zip - finished')
+            fs.createReadStream(outputPath).pipe(
+                request.put(url, {
+                    qs: {
+                        client: this.machineId,
+                        project: this.projectId,
+                        session: this.sessionId
+                    }
+                })
+                    .on('error', (err) => this.logError('zip upload connection error', url, safeError(err)))
+                    .on('complete', (resp) => {
+                        if (!(resp.statusCode >= 200 && resp.statusCode < 300)) {
+                            this.logError('zip upload http error', url, resp.statusCode, resp.body)
+                        } else {
+                            this.ctx.extensionOut.appendLine('zip - http upload finished')
+                        }
+                    })
+            )
+        })
+
+        this.ctx.extensionOut.appendLine('zip - starting')
+        zip.pipe(output)
+        zip.glob('./**/*.{scala,sc,sbt,java}', { cwd: rootPath })
+        zip.glob('./**/.dotty-ide{.json,-artifact}', { cwd: rootPath })
+        zip.finalize()
+    }
+
+    private createRemoteLspOutputChannel(
+        remoteTracingUrl: string,
+        localOutputChannel: vscode.OutputChannel
+    ): vscode.OutputChannel {
+        const createSocket = () => {
+            const socket = new WebSocket(remoteTracingUrl, {
+                headers: {
+                    'X-DLS-Project-ID': this.projectId,
+                    'X-DLS-Client-ID': this.machineId,
+                    'X-DLS-Session-ID': this.sessionId,
+                },
+            })
+
+            const timer = setInterval(
+                () => {
+                    if (socket.readyState === WebSocket.OPEN) {
+                        socket.send('')
+                    } else if (socket.readyState === WebSocket.CLOSED) {
+                        clearInterval(timer)
+                    }
+                },
+                10 * 1000 /*ms*/,
+            )
+
+            socket.onerror = (event) => {
+                this.logError(
+                    'socket error',
+                    remoteTracingUrl,
+                    new SafeJsonifier(event, (event) => ({
+                        error: safeError(event.error),
+                        message: event.message,
+                        type: event.type
+                    }))
+                )
+                vscode.window.showWarningMessage('An error occured in Dotty LSP remote tracing connection.')
+            }
+
+            socket.onclose = (event) => {
+                this.logError(
+                    'socket closed',
+                    remoteTracingUrl,
+                    new SafeJsonifier(event, (event) => ({
+                        wasClean: event.wasClean,
+                        code: event.code,
+                        reason: event.reason
+                    }))
+                )
+                vscode.window.showWarningMessage('Dotty LSP remote tracing connection was dropped.')
+            }
+
+            return socket
+        }
+
+        let alreadyCreated = false
+        let socket: WebSocket
+        // note: creating socket lazily is important for correctness
+        // if the user did not initially give his consent on IDE start, but gives it afterwards
+        // we only want to start a connection and upload data *after* being given consent
+        const withSocket: (thunk: (socket: WebSocket) => any) => void = (thunk) => {
+            // only try to create the socket _once_ to avoid endlessly looping
+            if (!alreadyCreated) {
+                alreadyCreated = true
+                try {
+                    socket = createSocket()
+                } catch (err) {
+                    this.logError('socket create error', safeError(err))
+                }
+            }
+
+            if (socket) thunk(socket)
+        }
+
+        let log: string = ''
+        let messageCounter: number = 0
+        // Avoid filling the user memory with log messages
+        let maxLocalMessages: number = 1000
+        return {
+          name: 'websocket',
+
+          append: (value: string) => {
+	    messageCounter++
+	    if (messageCounter > maxLocalMessages) {
+	      messageCounter = 0
+	      localOutputChannel.clear()
+	    }
+
+            localOutputChannel.append(value)
+            if (this.tracingConsent.get() === 'Deny') return
+            log += value
+          },
+
+          appendLine: (value: string) => {
+	    messageCounter++
+	    if (messageCounter > maxLocalMessages) {
+	      messageCounter = 0
+	      localOutputChannel.clear()
+	    }
+
+            localOutputChannel.appendLine(value)
+            if (this.tracingConsent.get() === 'Deny') {
+              log = ''
+              return
+            }
+
+            log += value
+            log += '\n'
+            if (this.tracingConsent.get() === 'Allow') withSocket((socket) => {
+              if (socket.readyState === WebSocket.OPEN) {
+                const send = (msg: string) => socket.send(msg, (err) => {
+                  if (err) {
+                    this.logError('socket send error', err)
+                  }
+                })
+
+                let start = 0
+                while (start < log.length) {
+                  send(log.substring(start, start + this.maximumMessageSize))
+                  start += this.maximumMessageSize
+                }
+                log = ''
+              }
+            })
+          },
+
+          clear() { },
+          show() { },
+          hide() { },
+          dispose() {
+            if (socket) socket.close()
+            localOutputChannel.dispose()
+          }
+        }
+    }
+
+    private logError(message: string, ...rest: any[]) {
+        const msg = `[Dotty LSP Tracer] ${message}`
+        // in a browser, we'd be able to log a SafeJsonifier directly
+        // and get an inspectable object in the console
+        // unfortunately, Electron apparently uses .toJson if available,
+        // so we need to manually unwrap SafeJsonifiers
+        console.error(msg, ...rest.map((a) => a instanceof SafeJsonifier ? a.value : a))
+        function cautiousStringify(a: any): string  {
+            try {
+                return JSON.stringify(a, undefined, 4)
+            } catch (err) {
+                console.error('cannot stringify', err, a)
+                return a.toString()
+            }
+        }
+        this.ctx.extensionOut.appendLine([msg].concat(rest.map(cautiousStringify)).join(' '))
+    }
+}
+
+function safeError(e: Error): SafeJsonifier<Error> {
+    return new SafeJsonifier(e, (e) => e.toString())
+}
+
+/**
+ * Wraps a value of type T so it's possible to safely pass it to JSON.stringify.
+ * 
+ * Values with circular references (errors, for example) cause JSON.stringify to throw an exception
+ */
+class SafeJsonifier<T> {
+    constructor(
+        readonly value: T,
+        readonly valueToObject: (t: T) => {}
+    ) {}
+
+    toJSON() {
+        return this.valueToObject(this.value)
+    }
+}
diff --git a/vscode-dotty/src/tracing-consent.ts b/vscode-dotty/src/tracing-consent.ts
new file mode 100644
index 000000000000..306fb1190b53
--- /dev/null
+++ b/vscode-dotty/src/tracing-consent.ts
@@ -0,0 +1,34 @@
+import { Memento } from 'vscode'
+
+export type TracingConsent = 'Allow' | 'Deny' | 'no-answer'
+
+export class TracingConsentCache {
+    private readonly workspaceState: Memento
+
+    // since updating Memento is async, caching prevents nonsense edge-cases
+    private cache?: TracingConsent
+    private subscribers: Array<() => void> = []
+
+    constructor(workspaceState: Memento) {
+        this.workspaceState = workspaceState
+    }
+
+    get(): TracingConsent {
+      if (this.cache !== undefined) return this.cache
+      const setting = this.workspaceState.get('remote-tracing-consent')
+      this.cache = setting === undefined ? 'no-answer'
+        : setting ? 'Allow'
+        : 'Deny'
+      return this.cache
+    }
+
+    set(value: 'Allow' | 'Deny'): void {
+      this.workspaceState.update('remote-tracing-consent', value === 'Allow')
+      this.cache = value
+      this.subscribers.forEach(f => f())
+    }
+
+    subscribe(callback: () => void): void {
+      this.subscribers.push(callback)
+    }
+}