langfuse-debug-bundle

Testing & Quality

Collect Langfuse debug evidence for support tickets and troubleshooting. Use when encountering persistent issues, preparing support tickets, or collecting diagnostic information for Langfuse problems. Trigger with phrases like "langfuse debug", "langfuse support bundle", "collect langfuse logs", "langfuse diagnostic", "langfuse troubleshoot".

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Langfuse Debug Bundle

Overview

Collect all necessary diagnostic information for Langfuse support tickets.

Prerequisites

Langfuse SDK installed
Access to application logs
Permission to collect environment info

Instructions

Step 1: Create Debug Bundle Script

#!/bin/bash
# langfuse-debug-bundle.sh

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

echo "=== Langfuse Debug Bundle ===" > "$BUNDLE_DIR/summary.txt"
echo "Generated: $(date)" >> "$BUNDLE_DIR/summary.txt"
echo "" >> "$BUNDLE_DIR/summary.txt"

Step 2: Collect Environment Info

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

# Langfuse config (redacted)
echo "--- Langfuse Config ---" >> "$BUNDLE_DIR/summary.txt"
echo "LANGFUSE_PUBLIC_KEY: ${LANGFUSE_PUBLIC_KEY:+[SET - ${LANGFUSE_PUBLIC_KEY:0:10}...]}" >> "$BUNDLE_DIR/summary.txt"
echo "LANGFUSE_SECRET_KEY: ${LANGFUSE_SECRET_KEY:+[SET]}" >> "$BUNDLE_DIR/summary.txt"
echo "LANGFUSE_HOST: ${LANGFUSE_HOST:-[NOT SET - using default]}" >> "$BUNDLE_DIR/summary.txt"
echo "" >> "$BUNDLE_DIR/summary.txt"

Step 3: Gather SDK and Package Info

# SDK versions
echo "--- SDK Versions ---" >> "$BUNDLE_DIR/summary.txt"
npm list langfuse 2>/dev/null >> "$BUNDLE_DIR/summary.txt" || echo "npm: langfuse not found" >> "$BUNDLE_DIR/summary.txt"
pip show langfuse 2>/dev/null >> "$BUNDLE_DIR/summary.txt" || echo "pip: langfuse not found" >> "$BUNDLE_DIR/summary.txt"
echo "" >> "$BUNDLE_DIR/summary.txt"

# Related packages
echo "--- Related Packages ---" >> "$BUNDLE_DIR/summary.txt"
npm list openai @anthropic-ai/sdk langchain 2>/dev/null >> "$BUNDLE_DIR/summary.txt"
echo "" >> "$BUNDLE_DIR/summary.txt"

Step 4: Test API Connectivity

# Network connectivity test
echo "--- Network Test ---" >> "$BUNDLE_DIR/summary.txt"

HOST="${LANGFUSE_HOST:-https://cloud.langfuse.com}"
echo "Testing host: $HOST" >> "$BUNDLE_DIR/summary.txt"

# Health check
echo -n "Health endpoint: " >> "$BUNDLE_DIR/summary.txt"
curl -s -o /dev/null -w "%{http_code}" "$HOST/api/public/health" >> "$BUNDLE_DIR/summary.txt"
echo "" >> "$BUNDLE_DIR/summary.txt"

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

Step 5: Collect Application Logs

# Recent logs (redacted)
echo "--- Recent Logs ---" >> "$BUNDLE_DIR/summary.txt"

# Search for langfuse-related logs
if [ -d "logs" ]; then
  grep -i "langfuse\|trace\|generation" 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/logs.txt"
fi

# npm logs
if [ -d "$HOME/.npm/_logs" ]; then
  grep -i "langfuse" "$HOME/.npm/_logs"/*.log 2>/dev/null | \
    tail -50 >> "$BUNDLE_DIR/npm-logs.txt"
fi
echo "Log files collected (if available)" >> "$BUNDLE_DIR/summary.txt"
echo "" >> "$BUNDLE_DIR/summary.txt"

Step 6: Capture Configuration Files

# Configuration (redacted)
echo "--- Config Files ---" >> "$BUNDLE_DIR/summary.txt"

# .env (redacted)
if [ -f ".env" ]; then
  cat .env 2>/dev/null | \
    sed 's/=.*/=***REDACTED***/' | \
    grep -i "langfuse\|openai\|anthropic" \
    >> "$BUNDLE_DIR/config-redacted.txt"
  echo ".env: captured (redacted)" >> "$BUNDLE_DIR/summary.txt"
fi

# package.json dependencies
if [ -f "package.json" ]; then
  grep -A 50 '"dependencies"' package.json | head -60 >> "$BUNDLE_DIR/package-deps.txt"
  echo "package.json: captured" >> "$BUNDLE_DIR/summary.txt"
fi

# tsconfig.json
if [ -f "tsconfig.json" ]; then
  cp tsconfig.json "$BUNDLE_DIR/"
  echo "tsconfig.json: captured" >> "$BUNDLE_DIR/summary.txt"
fi
echo "" >> "$BUNDLE_DIR/summary.txt"

Step 7: Package Bundle

# Add reproduction steps template
cat > "$BUNDLE_DIR/reproduction-steps.md" << 'EOF'
# Reproduction Steps

## 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 messages here


## Relevant Code
```typescript
// Paste relevant code here

EOF

Create archive

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


## Output
- `langfuse-debug-YYYYMMDD-HHMMSS.tar.gz` archive containing:
  - `summary.txt` - Environment and SDK info
  - `logs.txt` - Recent redacted application logs
  - `npm-logs.txt` - npm debug logs
  - `config-redacted.txt` - Configuration (secrets removed)
  - `package-deps.txt` - Dependencies
  - `reproduction-steps.md` - Template for bug report

## Sensitive Data Handling

**ALWAYS REDACT:**
- API keys (pk-lf-*, sk-lf-*)
- Secret keys and tokens
- Passwords and credentials
- PII (emails, names, IDs)
- Internal URLs and IPs

**Safe to Include:**
- Error messages and stack traces
- SDK versions
- Configuration structure (not values)
- HTTP status codes
- Timing information

## Quick Debug Script

Save as `langfuse-debug.sh`:
```bash
#!/bin/bash
set -e

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

# Quick diagnostics
{
  echo "=== Langfuse Quick Debug ==="
  echo "Date: $(date)"
  echo ""
  echo "--- Environment ---"
  echo "Node: $(node --version 2>/dev/null || echo 'N/A')"
  echo "Python: $(python3 --version 2>/dev/null || echo 'N/A')"
  echo ""
  echo "--- SDK ---"
  npm list langfuse 2>/dev/null || echo "npm: not found"
  pip show langfuse 2>/dev/null | grep Version || echo "pip: not found"
  echo ""
  echo "--- Config ---"
  echo "Public Key: ${LANGFUSE_PUBLIC_KEY:+SET}"
  echo "Secret Key: ${LANGFUSE_SECRET_KEY:+SET}"
  echo "Host: ${LANGFUSE_HOST:-default}"
  echo ""
  echo "--- Connectivity ---"
  HOST="${LANGFUSE_HOST:-https://cloud.langfuse.com}"
  echo "Health: $(curl -s -o /dev/null -w '%{http_code}' $HOST/api/public/health)"
} > "$BUNDLE_DIR/summary.txt"

tar -czf "$BUNDLE_DIR.tar.gz" "$BUNDLE_DIR"
echo "Created: $BUNDLE_DIR.tar.gz"

Error Handling

Item	Purpose	Included
Environment versions	Compatibility check	Yes
SDK version	Version-specific bugs	Yes
Error logs (redacted)	Root cause analysis	Yes
Config (redacted)	Configuration issues	Yes
Network test	Connectivity issues	Yes
Reproduction template	Bug reporting	Yes

Submit to Support

Run debug script: bash langfuse-debug.sh
Review bundle for sensitive data
Fill in reproduction-steps.md
Open issue at GitHub
Or post in Discord

Resources

Next Steps

For rate limit issues, see langfuse-rate-limits.