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🤖 feat: move telemetry reporting to backend (#905)
## Summary Moves telemetry event capture from the browser (`posthog-js`) to the Electron main process (`posthog-node`). Events from the renderer are forwarded via ORPC to the backend TelemetryService. ## Problem Ad blockers can intercept and block network requests to PostHog's servers (`us.i.posthog.com`) from the browser/renderer process, causing telemetry to be silently dropped. ## Solution Move telemetry to the main process using `posthog-node`. The main process makes direct HTTP requests that aren't subject to browser-based ad blocking. ### Architecture ```mermaid flowchart LR subgraph Renderer["Renderer (Browser)"] A[useTelemetry hook] B[trackEvent calls] end subgraph Main["Main Process (Node.js)"] C[ORPC telemetry routes] D[posthog-node client] end E[(PostHog)] A --> B B -->|ORPC| C C --> D D -->|HTTP| E ``` ## Changes - **New**: `posthog-node` dependency - **New**: `TelemetryService` in `src/node/services/` - **New**: ORPC `telemetry.{track, setEnabled, isEnabled}` routes - **Updated**: Frontend client now calls backend via ORPC - **Simplified**: Payload types no longer require base properties from frontend ## What Stays the Same - `useTelemetry()` hook API - `trackEvent()` function signature - Opt-out UX via localStorage - All existing event types ## Testing - `make typecheck` ✅ - `make lint` ✅ - `make static-check` ✅ - `make test` (1 pre-existing failure unrelated to this PR) _Generated with `mux`_
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‎bun.lock‎

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{
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"lockfileVersion": 1,
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"configVersion": 0,
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"workspaces": {
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"": {
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"name": "mux",
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"ollama-ai-provider-v2": "^1.5.4",
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"openai": "^6.9.1",
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"parse-duration": "^2.1.4",
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"posthog-node": "^5.17.0",
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"rehype-harden": "^1.1.5",
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"shescape": "^2.1.6",
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"source-map-support": "^0.5.21",
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"posthog-js": ["posthog-js@1.299.0", "", { "dependencies": { "@posthog/core": "1.6.0", "core-js": "^3.38.1", "fflate": "^0.4.8", "preact": "^10.19.3", "web-vitals": "^4.2.4" } }, "sha512-euHXKcEqQpRJNWitudVl4/doTJsftgaBDRLNGczt/v3S9N6ppLMzEOmeoqvNhNDIlpxGVlTvSawfw9HeW1r5nA=="],
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"posthog-node": ["posthog-node@5.17.0", "", { "dependencies": { "@posthog/core": "1.7.0" } }, "sha512-M+ftj0kLJk6wVF1xW5cStSany0LBC6YDVO7RPma2poo+PrpeiTk+ovhqcIqWAySDdTcBHJfBV9aIFYWPl2y6kg=="],
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"preact": ["preact@10.28.0", "", {}, "sha512-rytDAoiXr3+t6OIP3WGlDd0ouCUG1iCWzkcY3++Nreuoi17y6T5i/zRhe6uYfoVcxq6YU+sBtJouuRDsq8vvqA=="],
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"prelude-ls": ["prelude-ls@1.2.1", "", {}, "sha512-vkcDPrRZo1QZLbn5RLGPpg/WmIQ65qoWWhcGKf/b5eplkkarX0m9z8ppCat4mlOqUsWpyNuYgO3VRyrYHSzX5g=="],
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"pkg-dir/find-up": ["find-up@4.1.0", "", { "dependencies": { "locate-path": "^5.0.0", "path-exists": "^4.0.0" } }, "sha512-PpOwAdQ/YlXQ2vj8a3h8IipDuYRi3wceVQQGYWxNINccq40Anw7BlsEXCMbt1Zt+OLA6Fq9suIpIWD0OsnISlw=="],
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"posthog-node/@posthog/core": ["@posthog/core@1.7.0", "", { "dependencies": { "cross-spawn": "^7.0.6" } }, "sha512-d6ZV4grpzeH/6/LP8quMVpSjY1puRkrqfwcPvGRKUAX7tb7YHyp/zMiTDuJmOFbpUxAMBXH5nDwcPiyCY2WGzA=="],
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"pretty-format/ansi-styles": ["ansi-styles@5.2.0", "", {}, "sha512-Cxwpt2SfTzTtXcfOlzGEee8O+c+MmUgGrNiBcXnuWxuFJHe6a5Hz7qwhwe5OgaSYI0IJvkLqWX1ASG+cJOkEiA=="],
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"prop-types/react-is": ["react-is@16.13.1", "", {}, "sha512-24e6ynE2H+OKt4kqsOvNd8kBpV65zoxbA4BVsEOB3ARVWQki/DHzaUoC5KuON/BiccDaCCTZBuOcfZs70kR8bQ=="],

‎docs/telemetry.md‎

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@@ -4,11 +4,10 @@ mux collects anonymous usage telemetry to help us understand how the product is
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## Privacy Policy
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- **Opt-out by default**: You can disable telemetry at any time
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- **No personal information**: We never collect usernames, project names, file paths, or code content
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- **Random IDs only**: Only randomly-generated workspace IDs are sent (impossible to trace back to you)
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- **No hashing**: We don't hash sensitive data because hashing is vulnerable to rainbow table attacks
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- **Transparent data**: See exactly what data structures we send in [`src/telemetry/payload.ts`](https://github.com/coder/mux/blob/main/src/telemetry/payload.ts)
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- **Transparent data**: See exactly what data structures we send in [`src/common/telemetry/payload.ts`](https://github.com/coder/mux/blob/main/src/common/telemetry/payload.ts)
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## What We Track
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## Disabling Telemetry
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You can disable telemetry at any time using the `/telemetry` slash command:
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To disable telemetry, set the `MUX_DISABLE_TELEMETRY` environment variable before starting the app:
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```
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/telemetry off
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```
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To re-enable it:
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```
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/telemetry on
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```bash
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MUX_DISABLE_TELEMETRY=1 mux
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```
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Your preference is saved and persists across app restarts.
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This completely disables all telemetry collection at the backend level.
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## Source Code
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For complete transparency, you can review the telemetry implementation:
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- **Payload definitions**: [`src/telemetry/payload.ts`](https://github.com/coder/mux/blob/main/src/telemetry/payload.ts) - All data structures we send
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- **Client code**: [`src/telemetry/client.ts`](https://github.com/coder/mux/blob/main/src/telemetry/client.ts) - How telemetry is sent
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- **Privacy utilities**: [`src/telemetry/utils.ts`](https://github.com/coder/mux/blob/main/src/telemetry/utils.ts) - Base-2 rounding and helpers
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The telemetry system includes debug logging that you can see in the developer console (View → Toggle Developer Tools).
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- **Payload definitions**: [`src/common/telemetry/payload.ts`](https://github.com/coder/mux/blob/main/src/common/telemetry/payload.ts) - All data structures we send
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- **Backend service**: [`src/node/services/telemetryService.ts`](https://github.com/coder/mux/blob/main/src/node/services/telemetryService.ts) - Server-side telemetry handling
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- **Frontend client**: [`src/common/telemetry/client.ts`](https://github.com/coder/mux/blob/main/src/common/telemetry/client.ts) - Frontend to backend relay
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- **Privacy utilities**: [`src/common/telemetry/utils.ts`](https://github.com/coder/mux/blob/main/src/common/telemetry/utils.ts) - Base-2 rounding helper

‎package.json‎

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"ollama-ai-provider-v2": "^1.5.4",
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"openai": "^6.9.1",
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"parse-duration": "^2.1.4",
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"posthog-node": "^5.17.0",
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"rehype-harden": "^1.1.5",
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"shescape": "^2.1.6",
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"source-map-support": "^0.5.21",

‎src/browser/components/ChatInput/index.tsx‎

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@@ -63,7 +63,7 @@ import type { ThinkingLevel } from "@/common/types/thinking";
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import type { MuxFrontendMetadata } from "@/common/types/message";
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import { MODEL_ABBREVIATION_EXAMPLES } from "@/common/constants/knownModels";
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import { useTelemetry } from "@/browser/hooks/useTelemetry";
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import { setTelemetryEnabled } from "@/common/telemetry";
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import { getTokenCountPromise } from "@/browser/utils/tokenizer/rendererClient";
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import { CreationCenterContent } from "./CreationCenterContent";
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import { cn } from "@/common/lib/utils";
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return;
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}
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// Handle /telemetry command
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if (parsed.type === "telemetry-set") {
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setInput(""); // Clear input immediately
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setTelemetryEnabled(parsed.enabled);
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setToast({
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id: Date.now().toString(),
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type: "success",
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message: `Telemetry ${parsed.enabled ? "enabled" : "disabled"}`,
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});
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return;
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}
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// Handle /compact command
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if (parsed.type === "compact") {
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‎src/browser/components/ChatInputToasts.tsx‎

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),
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};
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case "telemetry-help":
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return {
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id: Date.now().toString(),
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type: "error",
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title: "Telemetry Command",
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message: "Enable or disable usage telemetry",
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solution: (
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<>
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<SolutionLabel>Usage:</SolutionLabel>
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/telemetry &lt;on|off&gt;
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<br />
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<br />
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<SolutionLabel>Examples:</SolutionLabel>
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/telemetry off
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<br />
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/telemetry on
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</>
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),
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};
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‎src/browser/components/TitleBar.tsx‎

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import { SettingsButton } from "./SettingsButton";
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import { TooltipWrapper, Tooltip } from "./Tooltip";
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import type { UpdateStatus } from "@/common/orpc/types";
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import { isTelemetryEnabled } from "@/common/telemetry";
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import { useTutorial } from "@/browser/contexts/TutorialContext";
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import { useAPI } from "@/browser/contexts/API";
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const [updateStatus, setUpdateStatus] = useState<UpdateStatus>({ type: "idle" });
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const [isCheckingOnHover, setIsCheckingOnHover] = useState(false);
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const lastHoverCheckTime = useRef<number>(0);
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const telemetryEnabled = isTelemetryEnabled();
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const { startSequence } = useTutorial();
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useEffect(() => {
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// Skip update checks if telemetry is disabled
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if (!telemetryEnabled) {
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return;
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}
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clearInterval(checkInterval);
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const handleIndicatorHover = () => {
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"Enable telemetry to receive updates."
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‎src/browser/hooks/useTelemetry.ts‎

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import { useCallback } from "react";
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import { trackEvent, getBaseTelemetryProperties, roundToBase2 } from "@/common/telemetry";
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import { trackEvent, roundToBase2 } from "@/common/telemetry";
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import type { ErrorContext } from "@/common/telemetry/payload";
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/**
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* Provides type-safe telemetry tracking with base properties automatically included.
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* Provides type-safe telemetry tracking. Base properties (version, platform, etc.)
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* are automatically added by the backend TelemetryService.
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*
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* Usage:
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* ```tsx
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fromWorkspaceId,
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‎src/browser/utils/chatCommands.ts‎

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export interface ForkOptions {
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‎src/browser/utils/slashCommands/registry.ts‎

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if (cleanRemainingTokens.length === 1) {
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const arg = cleanRemainingTokens[0].toLowerCase();
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subcommand: cleanRemainingTokens[0],
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suggestions: ({ stage, partialToken }) => {
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{ key: "on", description: "Enable telemetry" },
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{ key: "off", description: "Disable telemetry" },
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];
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return filterAndMapSuggestions(options, partialToken, (definition) => ({
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display: definition.key,
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description: definition.description,
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}));
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}
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return null;
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},
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};
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‎src/browser/utils/slashCommands/types.ts‎

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| { type: "clear" }
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| { type: "truncate"; percentage: number }
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| { type: "compact"; maxOutputTokens?: number; continueMessage?: string; model?: string }
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| { type: "telemetry-set"; enabled: boolean }
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| { type: "telemetry-help" }
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| { type: "fork"; newName: string; startMessage?: string }
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| { type: "fork-help" }
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| {

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