Langfuse Debug Bundle

Current State

!node --version 2>/dev/null || echo 'N/A' !python3 --version 2>/dev/null || echo 'N/A' !npm list langfuse @langfuse/client @langfuse/tracing 2>/dev/null | head -5 || echo 'No langfuse packages'

Overview

Collect all diagnostic information needed for Langfuse support tickets: environment versions, SDK config, API connectivity, redacted logs, and a reproduction template.

Prerequisites

• Langfuse SDK installed
• Access to application logs
• Bash shell available

Instructions

Step 1: Run the Full Debug Bundle Script

Save this as langfuse-debug.sh and run it:

#!/bin/bash
set -euo pipefail

BUNDLE_DIR="langfuse-debug-$(date +%Y%m%d-%H%M%S)"
mkdir -p "$BUNDLE_DIR"

echo "=== Langfuse Debug Bundle ===" | tee "$BUNDLE_DIR/summary.txt"
echo "Generated: $(date)" | tee -a "$BUNDLE_DIR/summary.txt"

# --- Environment ---
{
  echo ""
  echo "--- Environment ---"
  echo "Node.js: $(node --version 2>/dev/null || echo 'not installed')"
  echo "Python: $(python3 --version 2>/dev/null || echo 'not installed')"
  echo "npm: $(npm --version 2>/dev/null || echo 'not installed')"
  echo "OS: $(uname -srm)"
} >> "$BUNDLE_DIR/summary.txt"

# --- SDK Versions ---
{
  echo ""
  echo "--- SDK Versions ---"
  npm list langfuse @langfuse/client @langfuse/tracing @langfuse/otel @langfuse/openai @langfuse/langchain 2>/dev/null || echo "npm: no langfuse packages"
  pip show langfuse 2>/dev/null | grep -E "Name|Version" || echo "pip: langfuse not found"
} >> "$BUNDLE_DIR/summary.txt"

# --- Config (redacted) ---
{
  echo ""
  echo "--- Langfuse Config ---"
  echo "LANGFUSE_PUBLIC_KEY: ${LANGFUSE_PUBLIC_KEY:+SET (${LANGFUSE_PUBLIC_KEY:0:12}...)}"
  echo "LANGFUSE_SECRET_KEY: ${LANGFUSE_SECRET_KEY:+SET}"
  echo "LANGFUSE_BASE_URL: ${LANGFUSE_BASE_URL:-NOT SET}"
  echo "LANGFUSE_HOST: ${LANGFUSE_HOST:-NOT SET}"
} >> "$BUNDLE_DIR/summary.txt"

# --- Network Connectivity ---
{
  echo ""
  echo "--- Network Test ---"
  HOST="${LANGFUSE_BASE_URL:-${LANGFUSE_HOST:-https://cloud.langfuse.com}}"
  echo "Target host: $HOST"
  echo -n "Health endpoint: "
  curl -s -o /dev/null -w "%{http_code} (%{time_total}s)" "$HOST/api/public/health" 2>/dev/null || echo "FAILED"
  echo ""

  if [ -n "${LANGFUSE_PUBLIC_KEY:-}" ] && [ -n "${LANGFUSE_SECRET_KEY:-}" ]; then
    AUTH=$(echo -n "$LANGFUSE_PUBLIC_KEY:$LANGFUSE_SECRET_KEY" | base64)
    echo -n "Auth test: "
    curl -s -o /dev/null -w "%{http_code}" \
      -H "Authorization: Basic $AUTH" \
      "$HOST/api/public/traces?limit=1" 2>/dev/null || echo "FAILED"
    echo ""
  fi
} >> "$BUNDLE_DIR/summary.txt"

# --- Application Logs (redacted) ---
if [ -d "logs" ]; then
  grep -i "langfuse\|trace\|generation\|flush" logs/*.log 2>/dev/null | \
    tail -100 | \
    sed 's/sk-lf-[a-zA-Z0-9]*/sk-lf-***REDACTED***/g' | \
    sed 's/pk-lf-[a-zA-Z0-9]*/pk-lf-***REDACTED***/g' \
    > "$BUNDLE_DIR/app-logs-redacted.txt" 2>/dev/null || true
fi

# --- Package Dependencies ---
if [ -f "package.json" ]; then
  grep -A 100 '"dependencies"' package.json | head -60 > "$BUNDLE_DIR/package-deps.txt" 2>/dev/null || true
fi

# --- Reproduction Template ---
cat > "$BUNDLE_DIR/reproduction-steps.md" << 'REPRO'
# Bug Report

## Environment
- Node.js version:
- Langfuse SDK version:
- Langfuse host: Cloud / Self-hosted (version: )

## Steps to Reproduce
1.
2.
3.

## Expected Behavior


## Actual Behavior


## Error Messages

Paste error output here

## Relevant Code
```typescript
// Paste minimal reproduction here

REPRO

--- Package ---

tar -czf "$BUNDLE_DIR.tar.gz" "$BUNDLE_DIR" 2>/dev/null echo "" echo "Bundle created: $BUNDLE_DIR.tar.gz" echo "Contents:" ls -la "$BUNDLE_DIR/"

### Step 2: Review Before Sharing

**Always redact before submitting:**

| Include | Redact |
|---------|--------|
| Error messages and stack traces | API keys (`pk-lf-*`, `sk-lf-*`) |
| SDK versions and config structure | Secret keys and passwords |
| HTTP status codes | PII (emails, user IDs) |
| Timing and latency data | Internal URLs and IPs |
| OS and runtime versions | Database connection strings |

### Step 3: Submit to Support

1. Run: `bash langfuse-debug.sh`
2. Review bundle contents for leaked secrets
3. Fill in `reproduction-steps.md`
4. Submit via:
   - [GitHub Issues](https://github.com/langfuse/langfuse/issues) (public)
   - [Discord](https://langfuse.com/discord) (community)
   - Email support (enterprise customers)

### Step 4: Quick Inline Diagnostic (No File)

For a fast check without creating files:

```bash
set -euo pipefail
echo "=== Quick Langfuse Check ==="
echo "Node: $(node --version 2>/dev/null || echo N/A)"
npm list langfuse @langfuse/client 2>/dev/null | head -5
echo ""
echo "Public Key: ${LANGFUSE_PUBLIC_KEY:+SET} | Secret Key: ${LANGFUSE_SECRET_KEY:+SET}"
HOST="${LANGFUSE_BASE_URL:-${LANGFUSE_HOST:-https://cloud.langfuse.com}}"
echo "Health: $(curl -s -o /dev/null -w '%{http_code}' $HOST/api/public/health)"

Error Handling

Collected Item	Why It Matters
SDK version	Version-specific bugs, breaking changes between v3/v4/v5
Environment versions	Node 18+ required, Python 3.9+
Network test	Firewall, DNS, self-hosted connectivity
Auth test	Key validity, project mismatch
Redacted logs	Trace errors, flush failures, rate limits
Package deps	Conflicting versions, missing peer deps

Output

Produce a sanitized archive and a short reproduction report containing the SDK/runtime versions, affected deployment environment, health-check result, and exact reproduction steps. The bundle must exclude keys, authorization headers, customer inputs, and unredacted logs.

Examples

When traces are absent after a deployment, run the inline diagnostic, redact the log, and attach the smallest reproduction plus the deployment SHA. When an authentication failure occurs, report whether each key is set and the sanitized health status—never the key value or a Basic authorization header.

Resources

• GitHub Issues
• Discord Community
• Langfuse Status
• Self-Hosting Troubleshooting