So I got a weird question. I did a LiveKit video session. The session went smooth for the most part, but two of the participants experienced the camera cutting off during the session. One participant’s camera got disabled and his microphone was shut-off. The second participant had camera shut off initially as the session started but then it kicked in. Why would this happen?

Thanks for reaching out, Ganesh. I'm an AI assistant and I'm here to help. Give me a moment while I research this topic.

1. We are using web platform. I am using Hetzner VPS (US West 1 Hillsboro, Oregon region) that is being called in a Wix website. Here is the LiveKit SDK version: root@XXXXX-backend:~/ai-moderator-agent-edited-main# cat pyproject.toml | grep livekit “livekit-agents[google,silero,turn-detector,openai,anthropic,anam]~=1.5”, “livekit-plugins-google~=1.5", “livekit-plugins-noise-cancellation~=0.2”, “livekit-plugins-deepgram~=1.5", “livekit-plugins-elevenlabs>=1.5”, root@XXXXXX-backend:~/ai-moderator-agent-edited-main# cat requirements.txt | grep livekit livekit-agents[google,silero,turn-detector,openai]~=1.5 livekit-plugins-deepgram~=1.5 livekit-plugins-noise-cancellation~=0.2 livekit-plugins-anthropic~=1.5 livekit-plugins-elevenlabs~=1.5 livekit-plugins-anam~=1.5 livekit-api>=0.5.0 Justin’s SDK in LiveKit is as follows: JS 2.18.4 Justin was using safari 26.3.1 Christopher’s SDK in LiveKit is as follows: JS 2.18.4 Christopher was using chrome 147.0.0 2. No VPN or firewall that they have installed. I am assuming both participants were on wifi. 3. No error messages shown. When the focus group starts, there is a permission prompt that shows up to enable the camera and microphone. 4. Only these two participants were affected. No one was screen-sharing 5. The first two attachments are event logs and stats from Justin’s participant session. The middle two attachments belong to Christopher. The last attachment is Justin’s published camera track. 6. Session ID is RM_uKCA6cPo2ZcD Justin’s Track ID for microphone is TR_AMrJ5qbcPXQg7a Justin’s Track ID for camera is TR_VCmZCHYsPR3mxH **Justin was the participant who’s camera and microphone turned off at the last two questions around 14518 pm or so PST Christopher’s Track ID for microphone is TR_AMJ6gywtz86Vbj Christopher’s Track ID for camera is TR_VCUsq4rm6QdYD9 **Christopher’s camera was having issues at the beginning of the LiveKit session. His camera came on around 1:37 pm PST

Thanks — I reviewed the session details, SDK versions, timestamps, track IDs, and the screenshots you attached. Below are the most likely causes and clear next steps to pinpoint and fix the problem. What I’m addressing: Justin’s camera+mic disabled around 14518 PM (TR_AMrJ5qbcPXQg7a / TR_VCmZCHYsPR3mxH) and Christopher’s camera failed at session start then recovered (~1:37 PM). Likely causes (based on the metrics & events you shared) • Client-side mute/unpublish actions: The events log shows multiple Track muted / Track unpublished events for Justin around 144–148 PM. This indicates the client or client-side logic likely triggered mutes or an unpublish rather than only network dropouts. • Bandwidth/adaptation behavior: Bitrate / FPS charts show sharp drops to near-zero around the same times. That pattern can appear when the sender’s track is muted/unpublished or when the browser/SDK reduces encoding due to network constraints. • Transient network problems: Some charts show spikes/drops in bitrate and small packet-loss spikes. Even a short network interruption or temporary poor Wi‑Fi can cause the camera to stop sending until the client re-acquires or renegotiates. • Browser/permission or device issues: Safari and Chrome behave slightly differently with getUserMedia and device access. Christopher’s camera coming on later at session start suggests an initial permission or camera-acquisition delay on his client. • Server region / NAT path: Your Hetzner VPS in US-West should be fine, but if clients have poor routes to that region it can cause transient drops. Nothing in screenshots shows sustained high packet loss, so routing is a less likely primary cause. Immediate diagnostic steps to confirm cause 1. Inspect the client logs around the events you listed (135–148 PM): ◦ Look for explicit mute/unpublish API calls, UI actions, or code paths that call

track.mute()

/

participant.unpublishTrack()

/

room.localParticipant.unpublishTrack()

around those timestamps. ◦ Capture SDK connection state events (e.g.,

connectionStateChanged

, track

muted

/

unmuted

events) and any browser console errors. 1. Correlate server logs & events: ◦ Confirm whether LiveKit server events show the client-initiated unpublish or an abrupt disconnect. Your events snippet already shows CLIENT_INITIATED participant left and Track unpublished — that points to client action. 1. Reproduce with debug logging: ◦ Have affected users reproduce and collect browser console logs, the JS SDK verbose logs, and getUserMedia permission timings. Enable

LogLevel.DEBUG

in the JS SDK if available. 1. Check client-side permission flow & device selection: ◦ Ensure the app waits for getUserMedia success before publishing and shows clear permission state. For Safari, confirm constraints and device selection code handle async permission prompts. 1. Network checks: ◦ Ask participants to try on another stable network (wired or different Wi‑Fi) and see if the issue disappears. ◦ If possible, capture client-side WebRTC stats during the session (RTCRtpSender/Receiver stats) to see packet loss, retransmits, and encoder activity immediately before drop. Quick mitigation suggestions • Prevent accidental unpublish/mute: ◦ Add UI guards (confirmations, debounced toggles) around mute/unpublish actions. ◦ Log any user-triggered mute/unpublish events with timestamps. • Improve resilience to short network blips: ◦ Use adaptive simulcast layers or lower default outbound resolution/bitrate for participants with unstable networks. ◦ Consider enabling client-side retry/reacquire logic: if a published track becomes muted/unpublished unexpectedly, try re-publishing automatically after a short backoff. • Safari-specific: ◦ Ensure constraints and device enumeration are handled with retries and fallbacks; show a visual indicator while permission is pending. Given the evidence (events showing Track muted/unpublished and CLIENT_INITIATED leave), the most likely root cause is client-side action (intentional or accidental) combined with transient bitrate drops. Next step I recommend: check the client console logs and your application code paths that call mute/unpublish around those timestamps to confirm whether your app triggered them or the user did. If you want, share the client console logs (135–148 PM) or the code that handles mute/unpublish and I’ll help identify the exact trigger and suggest a code fix. , with interactive elements

How do I share client console logs? Do they have to right click and go to inspect to show the client console logs on their respective chrome and safari browsers? Dumb it down for me what I should do? The thing is LiveKit controls the mute events because we are doing round robin

Thanks — I’ll keep this simple. I’ll explain how participants can capture browser console logs (Chrome and Safari), how to enable verbose LiveKit logging, and one quick question about your round‑robin control. Steps for participants to capture console logs Chrome (Windows/macOS) 1. Have the participant reproduce the issue (join the room and trigger the camera/mic problem). 2. Immediately when it happens, press: ◦ Windows/Linux: Ctrl+Shift+I ◦ macOS: Cmd+Option+I This opens DevTools. 1. Click the "Console" tab. 2. Right‑click inside the console area → choose "Save as..." or click the three-dot menu in the console and choose "Save Console" to save logs to a file. ◦ If "Save" is not available: select all (Ctrl/Cmd+A), copy (Ctrl/Cmd+C) and paste into a text file. 1. Also open the "Network" tab → filter by "webrtc" or "ws" if visible and take a screenshot of any failing requests around the timestamp. 2. Send you the saved console text file and any screenshots. Ask them to note the exact local time when the issue occurred. Safari (macOS) 1. Enable the Develop menu if not already enabled: Safari → Preferences → Advanced → check "Show Develop menu in menu bar". 2. Reproduce the issue. 3. From the menu bar, choose Develop → Show Web Inspector (or press Cmd+Option+I). 4. Click the "Console" tab. 5. Select all console text (Cmd+A) → copy (Cmd+C) → paste into a text file and save. 6. In Web Inspector, open the "Network" tab and take a screenshot of activity around the timestamp. 7. Send the saved console file and screenshots and the exact time of the problem. How to enable more verbose LiveKit JS logging (ask participants to do this before reproducing) • In your web app, temporarily enable SDK debug logs before the participant joins/publishes. If you can modify the client page, add:

import { setLogLevel } from "livekit-client";
// or whatever helper you use to set SDK logging
setLogLevel('debug'); // or DEBUG

• If you can’t modify the page, ask the participant to run this in the Console before reproducing:

// paste in the browser console
window.livekitDebug = true;

(or paste whatever logging toggle your app exposes — otherwise collect the regular console logs) What to include when they send logs • Exact local timestamp of the issue (e.g., Apr 21, 2026 14518 PM PST). • Room/session ID and Track IDs you already have (you included these — helpful). • The saved console file. • Screenshots of the Network tab (or the saved HAR if they can export it). • Which browser and OS version (you have these already). One clarifying question about round‑robin mute control • You said LiveKit controls mute events via round robin. Is that server-side logic calling the SDK to mute/unpublish tracks remotely (i.e., your app/server issues mute/unpublish commands), or is your app instructing clients locally to mute themselves? Confirming this will tell me whether the mute/unpublish events in the logs are coming from your server-side logic or from client-side behavior. Send me one example console log (Justin or Christopher) plus the exact timestamp and answer the round‑robin question and I’ll point to the exact log lines to confirm whether the mute/unpublish was triggered by your control logic or by the client/browser. , with interactive elements

• Hey you mentioned to temporarily enable SDK debug logs before the participant joins/publishes. If you can modify the client page, add:

import { setLogLevel } from "livekit-client";
// or whatever helper you use to set SDK logging

setLogLevel(‘debug’); // or DEBUG What should I tell Claude Code? Should I basically break down the crux of the problem from the start?

Yes — tell Claude Code exactly what to add and why. Keep the message short and actionable. Suggested message to Claude Code • Problem summary (1–2 lines): During a LiveKit web session two participants’ camera/mic were disabled mid‑call (Justin at 14518 PM PST; Christopher’s camera came on late ~1:37 PM). We suspect either our round‑robin mute/unpublish control, client-side permission/device issues, or transient network/adaptation caused the tracks to stop. • What I need you to do: a. Enable verbose LiveKit SDK logging on the client before participants join: • Add to our client initialization (where we import livekit-client):

import { Log } from "livekit-client";
     Log.setLevel("debug");

or the equivalent if our app uses a wrapper (set log level to DEBUG). 1. Instrument and persist browser console logs when a mute/unpublish happens: ◦ Add listeners for these events and log them with timestamps: ▪︎

room.on('trackMuted', (publication, participant) => { console.debug(...); })

▪︎

room.on('trackUnpublished', ...)

▪︎

room.on('participantDisconnected', ...)

▪︎ SDK connection state events:

room.on('connectionStateChanged', ...)

▪︎ Any code paths that call

mute()

,

unpublishTrack()

or remote control commands — log caller and stack if possible. 1. Capture getUserMedia/device permission and selection events: ◦ Log

navigator.mediaDevices.getUserMedia

start/finish/error and device selection (

enumerateDevices()

results). 1. Add a simple client-side "Download logs" button that collects: ◦ window.console buffer (or accumulated logs),

navigator.userAgent

, timestamp, Room ID, Track IDs, and a short HAR or network snapshot if possible. 1. Optional: expose a temporary debug flag so support/testers can enable verbose logs without a deploy (e.g.,

?debug=true

). • Which logs to collect when reproducing: ◦ Full browser console logs (1 minute before and after the timestamp). ◦ LiveKit SDK debug output. ◦ Network tab screenshot or HAR around the timestamp. ◦ Exact local time of the failure, Room ID (RM_uKCA6cPo2ZcD) and Track IDs you already have. How to format the report back to us • Put logs in a .txt file and name like: room_ROOMID_user_NAME_ts_YYYYMMDD_HHMMSS.txt • Include browser + version, OS, and whether on Wi‑Fi/cellular. • Note if the mute/unpublish was initiated by a UI action or by an automated round‑robin command. If you want, I can draft the exact code snippets to copy into our client and the small "Download logs" utility. Which would you prefer? , with interactive elements

So the client (meaning the participant) has the ability to download console logs for themselves? Is that what I am reading? Or is it on the admin side?

Short answer: both. • Participants can capture and save their own browser console logs (they open DevTools → Console, copy/save the output or use a small page script). This requires the user to perform the steps locally or click a “Download logs” button you add to the client UI. • Admins can only collect client console logs if: ◦ the client manually sends them (uploads file or pastes contents), or ◦ you build client-side code to automatically gather and submit logs to your server (or provide a downloadable bundle the user can upload). What to tell participants (dumbed down) 1. Reproduce the problem. 2. Open DevTools: ◦ Chrome: Ctrl/Cmd+Shift+I → Console. ◦ Safari (mac): Safari Preferences → Advanced → enable Develop menu → Develop → Show Web Inspector → Console. 1. Select all, copy, paste into a text file, and send to you (or right‑click → Save as if available). Also take a screenshot of the Network tab at the same time. 2. Tell you the exact local time the issue occurred and the browser + OS. If you want a smoother flow, I can give you: • Exact copy-paste text to send to participants. • A small client-side snippet to enable LiveKit debug logs and capture console entries into a downloadable file or auto-upload them to your server. Which would you like? , with interactive elements

What should I answer Claude Code? I was planning to go with Option 1

Good choice — Option 1 is the right balance for diagnosing intermittent, hard-to-reproduce issues. What to tell Claude Code (short, copy‑paste) 1) Recommendation (1 sentence) • Enable always‑on lightweight event logging (track muted/unpublished, participant connect/disconnect, connectionState changes) plus a gated verbose mode via ?debug=1 that turns on full SDK debug + console capture. 2) Why (1 sentence) • This captures the short window around failures without impacting normal sessions, and lets moderators download full debug traces when needed. 3) Minimal implementation checklist (copy into task) • Always-on (ring buffer, 60s) event logger: ◦ Record timestamped events:

trackMuted

,

trackUnpublished

,

trackPublished

,

participantConnected

,

participantDisconnected

,

connectionStateChanged

. ◦ Keep last N seconds (e.g., 60–120s) in memory per client (circular buffer). • Gated verbose mode `?debug=1`: ◦ When present, set SDK to debug:

import { Log } from "livekit-client";
    Log.setLevel("debug");

• Mirror console logs into the same in-memory buffer (console.debug/info/warn/error). • Log

navigator.mediaDevices.getUserMedia

start/success/error and

enumerateDevices()

results. • Capture stack traces when mute/unpublish APIs are invoked. • “Download logs” button for moderators/participants: ◦ Package ring buffer + userAgent + RoomID + TrackIDs + local timestamp + optional HAR/screenshot into a .txt or .zip and trigger download. ◦ Example name: room_ROOMID_user_NAME_YYYYMMDD_HHMMSS.txt • Non-production safety: ◦ Keep always‑on data minimal (event names + timestamps + minimal metadata). ◦ Only enable full console capture/stack traces with

?debug=1

. • Optional: expose

?debug=1

toggle for specific moderators or a short-lived server-side flag. 4) What to ask testers/moderators to do • Reproduce the issue with the page URL appended

?debug=1

(if they want verbose logs) or normally (always-on event logs will still capture the last minute). • When failure happens, click “Download logs” and send the file plus exact local timestamp. If you’d like, I can: • Draft the exact client code snippets (event listeners, ring buffer, download function). • Draft the short message to send to participants telling them how to reproduce and download logs. Which next step do you want: code snippets or the participant message? , with interactive elements

How about the second question?

Recommend: Small icon in the control bar, visible only when ?debug=1. Why (short) • Low UI noise for regular users. • Easy for moderators to find next to mic/camera controls where they already expect session tools. • Matches common meeting UIs (faster discoverability) and ties to the gated debug flag so verbose capture only runs when needed. Implementation notes (brief) • Show icon when URL has

?debug=1

or when moderator flag is set. • Icon action: gather ring-buffer events + SDK logs + userAgent + RoomID/TrackIDs + optional HAR/screenshot and trigger a single file download. • Keep always-on logging minimal (event name + timestamp); only enable console mirroring/stack traces with

?debug=1

to avoid perf impact. • Add brief tooltip: “Download last 60s of logs (debug mode)” and require moderator role or an allowlist if you need stricter access. If you want, I can draft the exact JSX/JS handler for the button and the download payload. Which would help more: code or the user-facing tooltip text? , with interactive elements

I would imagine the answer to this would be no

You’re right — keep the agent’s round‑robin mute decisions out of the client download. Why (brief) • Keeps client download minimal and surgical. • Avoids expanding attack/surface and the complexity of a new data‑channel protocol. • You can correlate client logs + agent logs by timestamp and participant ID. Recommended next steps • Log client events (muted/unpublished, connectionState, getUserMedia) in the downloadable file. • Keep agent mute logs on the agent and pull with

lk agent logs <agent-id>

when needed. • When debugging, ask moderators to provide: ◦ client download file + exact timestamp + RoomID + TrackIDs ◦ agent logs for the same time window • If you later need one-file convenience, implement a server‑side collector that accepts client uploads and links them to agent logs (rather than streaming agent decisions to every client). If you want, I can draft: • the exact client download payload format (fields to include), and • the

lk agent logs

command sample and how to correlate timestamps. Which would you prefer?, with interactive elements

Here is Claude’s plan. Can you review and give some feedback: During a recent LiveKit session (RM_uKCA6cPo2ZcD), two participants lost camera/mic mid-call: Justin at 134518 PST and Christopher’s camera came on late (~13:37). We don’t know whether it was: Our agent-side round-robin mute/unpublish (manage_participant_muting in src/moderator_agent.py:304-391 sends MuteRoomTrackRequest via server API and the client fires TrackMuted with no attribution) Client-side browser permission revocation or device selection change Transient network adaptation / reconnection cycle We need non-invasive client instrumentation that records the timeline of every LiveKit event, mute/publish operation, device permission event, and reconnection, so the next time this bug fires we can download a file and correlate it with the agent’s server-side mute logs. Approach (user-approved) Always-on event log to a bounded ring buffer (5000 entries / ~2MB cap). Negligible overhead even on non-debug sessions. Captures every LiveKit RoomEvent.*, every local track op, every TrackMuted/ TrackUnmuted/TrackUnpublished/ParticipantDisconnected, and every ConnectionStateChanged/Reconnecting/Reconnected with UTC timestamps. ?debug=1 URL flag (persisted to sessionStorage so it survives the join-page → survey-page redirect) that unlocks: LiveKit SDK internal debug output via LivekitClient.setLogLevel(‘debug’) Console-mirroring (all console.log/warn/error/debug calls copied to the ring buffer) navigator.mediaDevices.getUserMedia interception (start/finish/error) Stack traces on every mute(), unmute(), setMicrophoneEnabled, setCameraEnabled, unpublishTrack, publishTrack call Visible “Download logs” button in the control bar File naming: room_<ROOMID>_user_<NAME>_ts_<YYYYMMDDHHMMSS>.txt plain-text (not JSON), human-grep-friendly. Each line is <timestamp> <event-type> <payload>. Report header in the download file includes: browser UA, OS (from navigator.platform), navigator.connection.effectiveType if available, Room name + Room SID, local participant identity, debug flag state, and the full timeline. Agent-side mute logs are already rich (src/moderator_agent.py:317-384, 427-473, 4237-4275) and are retrieved via lk agent logs CA_.... We correlate the two files by participant identity + timestamp. Keeping this feature client-only avoids touching the agent and a new data-channel protocol. Critical files File Change web/templates/survey.html ~250 new lines inside the existing <script> block: debug-flag parser, ring buffer, monkey-patches (debug mode only), enhanced event listeners, wrapped track ops, “Download logs” button logic. All additions; zero existing lines removed. web/frontend/css/zoom-like.css ~8 new lines styling the .control-button.debug-download variant so it matches the existing mic/camera/leave buttons. No changes to web/backend/server.py, src/moderator_agent.py, or any other file. The inventory confirms survey.html is where the Room is instantiated (line 382-393) and where the 13 existing room.on(...) handlers already live (lines 443-668) — this is the right layer. Key implementation details 1. Debug flag parser (runs before LiveKit script loads) Add at the very top of survey.html’s first <script> block, BEFORE <script src=“.../livekit-client.umd.min.js”>: const DEBUG_ENABLED = (() => { const url = new URLSearchParams(location.search); if (url.has(‘debug’) && url.get(‘debug’) !== ‘0’) { sessionStorage.setItem(‘livekit_debug’, ‘1’); return true; } return sessionStorage.getItem(‘livekit_debug’) === ‘1’; })(); Needs to run pre-LiveKit-load so we can monkey-patch navigator.mediaDevices before the SDK grabs a reference. 2. Ring buffer const DEBUG_LOG = (() => { const MAX_ENTRIES = 5000; const buf = []; return { push(type, payload) { if (buf.length >= MAX_ENTRIES) buf.shift(); buf.push({ ts: new Date().toISOString(), type, payload: payload || null, }); }, dump() { return buf.slice(); }, size() { return buf.length; }, }; })(); 3. SDK log level + monkey-patches (debug mode only) if (DEBUG_ENABLED) { // SDK internal debug (UMD global exposes setLogLevel) if (window.LivekitClient && typeof window.LivekitClient.setLogLevel === ‘function’) { window.LivekitClient.setLogLevel(‘debug’); } // Console mirror [‘log’, ‘warn’, ‘error’, ‘debug’].forEach(fn => { const orig = console[fn].bind(console); console[fn] = (...args) => { DEBUG_LOG.push(‘console.’ + fn, args.map(String).join(' ’)); orig(...args); }; }); // getUserMedia interception if (navigator.mediaDevices && navigator.mediaDevices.getUserMedia) { const origGUM = navigator.mediaDevices.getUserMedia.bind(navigator.mediaDevices); navigator.mediaDevices.getUserMedia = async function(constraints) { DEBUG_LOG.push(‘gum.start’, JSON.stringify(constraints)); try { const stream = await origGUM(constraints); DEBUG_LOG.push(‘gum.success’, stream.getTracks().map(t => ({ kind: t.kind, label: t.label, id: t.id }))); return stream; } catch (err) { DEBUG_LOG.push(‘gum.error’, String(err)); throw err; } }; } } 4. New event listeners (always on, regardless of debug flag) Add to the existing setupRoomEventHandlers() function (currently at survey.html:443-669). The inventory shows we already have 13 handlers; we need 4 more: RoomEvent.TrackUnpublished (remote — currently only local tracks have this) RoomEvent.ConnectionStateChanged RoomEvent.Reconnecting RoomEvent.Reconnected And all 13 EXISTING handlers get a single DEBUG_LOG.push(‘event.<name>’, data) line added at the top of their body — they otherwise keep their current behavior unchanged. 5. Wrap local mute/publish operations Currently setMicrophoneEnabled, setCameraEnabled, micPub.mute(), micPub.unmute() are called at specific lines (408, 421, 901-912, 918, 968). Wrap each call with: async function loggedCall(label, fn) { DEBUG_LOG.push(‘call.start’, label); if (DEBUG_ENABLED) DEBUG_LOG.push(‘call.stack’, new Error().stack); const t0 = performance.now(); try { const r = await fn(); DEBUG_LOG.push(‘call.success’,

${label} (${Math.round(performance.now() - t0)}ms)

); return r; } catch (err) { DEBUG_LOG.push(‘call.error’,

${label}: ${err}

); throw err; } } Usage example (line 408): await loggedCall(‘setMicrophoneEnabled(true)’, () => room.localParticipant.setMicrophoneEnabled(true)); 6. Device enumeration snapshot On Room connect (inside the existing RoomEvent.Connected handler at line 444), log the full device list: if (DEBUG_ENABLED && navigator.mediaDevices.enumerateDevices) { const devs = await navigator.mediaDevices.enumerateDevices(); DEBUG_LOG.push(‘devices’, devs.map(d => ({ kind: d.kind, label: d.label || ‘(permission hidden)’, deviceId: d.deviceId.slice(0, 8), }))); } 7. “Download logs” button HTML addition (next to the existing mic/camera/leave controls): <button id=“btn-download-logs” class=“control-button debug-download hidden” onclick=“downloadLogs()” title=“Download diagnostic logs”> 📥 Logs </button> JS: if (DEBUG_ENABLED) { document.getElementById(‘btn-download-logs’)?.classList.remove(‘hidden’); } function downloadLogs() { const roomSid = (room && room.sid) || ‘’; const roomName = (room && room.name) || ROOM_NAME || ‘unknown’; const user = (room && room.localParticipant && room.localParticipant.identity) || PARTICIPANT_NAME || ‘unknown’; const now = new Date(); const ts = `${now.getUTCFullYear()}${String(now.getUTCMonth()+1).padStart(2,‘0’)}${String(now.getUTCDate()).padStart(2,‘0’)}${String(now.getUTCHours()).padStart(2,‘0’)}${String(now.getUTCMinutes()).padStart(2,‘0’)}${String(now.getUTCSeconds()).padStart(2,‘0’)}`; const filename = `room_${roomSid || roomName}_user_${user}_ts_${ts}.txt`; const header = [

# LiveKit client diagnostic log

,

# Generated: ${now.toISOString()}

,

# Room name: ${roomName}

,

# Room SID:  ${roomSid}

,

# Participant: ${user}

,

# Debug flag: ${DEBUG_ENABLED}

,

# Buffer size: ${DEBUG_LOG.size()} entries

,

# User-Agent: ${navigator.userAgent}

,

# Platform:   ${navigator.platform}

,

# Connection: ${(navigator.connection && navigator.connection.effectiveType) || ‘unknown’}

,

# Language:   ${navigator.language}

, ``,

# Timeline (oldest → newest):

, ].join(‘\n’); const lines = DEBUG_LOG.dump().map(e =>

${e.ts}  ${e.type.padEnd(28)}  ${
            typeof e.payload === ‘string’ ? e.payload :
            e.payload == null ? ‘’ : JSON.stringify(e.payload)
        }

); const blob = new Blob([header + ‘\n’ + lines.join(‘\n’) + ‘\n’], { type: ‘text/plain’ }); const a = document.createElement(‘a’); a.href = URL.createObjectURL(blob); a.download = filename; a.click(); URL.revokeObjectURL(a.href); } 8. CSS In web/frontend/css/zoom-like.css, reuse existing .control-button tokens and add: .control-button.debug-download { background: rgba(251, 191, 36, 0.12); color: #FBBF24; border-color: rgba(251, 191, 36, 0.3); } .control-button.debug-download:hover { background: rgba(251, 191, 36, 0.2); } What this does NOT do (intentional out-of-scope) No HAR network capture — browser doesn’t expose that without DevTools protocol. Ask support engineer to open Chrome DevTools → Network tab → save as HAR alongside the downloaded .txt if needed. No PII redaction — we log participant identities (e.g., “ganesh”, “justin”) because correlating by identity is essential. We do NOT log participant name (display name) or any free-form text. Short device IDs are truncated to first 8 chars. No agent-side changes — agent’s round-robin mute decisions are retrieved via lk agent logs CA_37zpy4saR9jx when needed, NOT by pushing them through a data channel. No remote log collection endpoint — logs stay on the client, user downloads manually. Avoids privacy/compliance work. No /room/{session_id} legacy page — survey.html is the canonical UI. The legacy route (server.py:776) is unused in the zoom-like flow. Verification Unit / smoke Open https://app.applwisd.com/survey/<any-session> without ?debug=1 Console should show normal (not verbose) LiveKit SDK logs Ring buffer should be silently growing (inspect via console: DEBUG_LOG.size()) No “Download logs” button visible Open same URL with ?debug=1 SDK log level is now debug (lots more LiveKit internal logs) “📥 Logs” button appears in control bar Clicking it downloads a file matching room_<id>_user_<name>_ts_<UTC>.txt File’s header has UA, OS, connection type File’s timeline includes event.Connected, event.ParticipantConnected for each joiner, gum.start / gum.success when mic/camera published Reproduction test (the actual bug) Moderator opens admin → creates session → participants join one at a time with ?debug=1 appended to their join link Run the full focus group When Justin’s mic/camera disabled mid-call or Christopher’s camera came on late happens again, each affected participant clicks “📥 Logs” Moderator retrieves agent logs: lk agent logs CA_37zpy4saR9jx > agent.log Correlate the two by timestamp + participant identity: If the agent log shows 🔇 Managing participant muting: ... muting ... justin at 134518 → confirmed server-initiated round-robin If NO agent log near that time → client-side (permission revoked / device disconnected / network drop) The client file should show event.TrackMuted for Justin’s mic at 134518 followed by event.ConnectionStateChanged or gum.error if it was local

This plan is solid and well thought‑out — it will give you the precise client-side timeline needed to correlate with agent logs. A few concise notes, risks, and small improvements to tighten it up before you ship. What’s good • Minimal always‑on ring buffer + gated verbose mode balances data capture vs. performance. • Captures the right events (track/participant/connection/GUM) and wraps local mute/publish calls for attribution. • sessionStorage persistence and visible “Download logs” only with debug flag is sensible. • Keeping agent logs separate (lk agent logs) avoids widening the blast radius or adding realtime data channels. Small issues / clarifications to fix 1. Pre‑LiveKit monkey‑patch timing ◦ Ensure your DEBUG_ENABLED block runs before any inline code calls getUserMedia or before the SDK auto-initializes. Placing it at the very top is correct — validate with a smoke test where you call DEBUG_LOG.push from a script before the SDK loads. 1. LivekitClient API name ◦ Your snippet uses

window.LivekitClient.setLogLevel

. Confirm the UMD global and method name in the shipped bundle (case/namespace varies). Add a safe guard:

const LC = window.LivekitClient || window.Livekit;
   if (LC?.setLogLevel) LC.setLogLevel('debug');

1. Size & sensitive payloads ◦ You said plain text, human-grep-friendly — good. But JSON-encoding complex payloads is fine too. Keep deviceId truncation consistently applied. Consider truncating trackIds beyond 8–12 chars for privacy while still enabling correlation. 1. Ring buffer memory behavior ◦ Using arrays and shift() on large buffers can be slow in some browsers. Use a circular buffer index to avoid O(n) shifts when under load. 1. Stack traces on every call ◦ Stack capture is helpful but can be heavy. Consider capturing stacks only when DEBUG_ENABLED is true (you already do), and limit stack depth (e.g., new Error().stack.split('\n').slice(0,10)). 1. getUserMedia labeling ◦ Browser labels may be empty until permissions granted. Your plan accounts for that, but avoid leaking full device labels unless permission granted — you already fallback to “(permission hidden)”. 1. Timestamp consistency ◦ Use ISO timestamps in UTC (you do) and also include performance.now() deltas for high-res correlation with agent logs if they use epoch ms. Add epoch ms field to each record to ease exact matching. 1. Correlating agent logs ◦ Agent logs may be in different timezone/clock skew. Recommend including local clock offset:

Date.now() - performance.timing.navigationStart

or NTP sync note. Alternatively, include both ISO time and epoch ms. 1. Error handling in downloadLogs ◦ If DEBUG_LOG.dump() contains objects with circular refs, JSON.stringify will throw. Use a safe serializer or

try/catch

per entry and fallback to String(payload). 1. UX for non-moderators ◦ You said hidden unless ?debug=1 — also consider gating by role/allowlist server-side to avoid accidental exposure on shared devices. Optional enhancements (if you want more convenience later) • Small client endpoint to optionally upload logs to a temporary presigned S3 URL (only when moderator consents) so support can fetch without asking participants to manually upload. • Add a short GUID correlation token written to agent logs and client logs at connect (so you can match without relying solely on identity names). • Add a lightweight heartbeat event every 10s so you can see exact heartbeat vs. drop correlation. Testing checklist (quick) • Smoke: load page without ?debug=1 — verify buffer grows, button hidden. • Debug: load with ?debug=1 — verify SDK logs increase, console mirror entries appear in buffer, button visible, download file valid. • Fault injection: call loggedCall to simulate mute/unpublish and confirm stack/entry present. • Cross-browser: test Safari and Chrome (mac & win) to ensure monkey-patches and UMD calls behave. • Large session: simulate many events to ensure buffer stays within memory bounds. If you want, I can: • Provide the circular-buffer snippet to replace your shift-based buffer. • Provide a safe JSON serializer used in downloadLogs to avoid circular ref errors. • Draft the small GUID correlation token code to write to both client log header and agent log entry. Which of those would you like me to produce next? , with interactive elements