Log Monitoring

Monitor current logs across the OpenAlgo system in real-time. Track log file sizes, watch for new entries, detect log rotation, and check log health.

Log Sources

System Logs

• Location: openalgo/log/
• Pattern: openalgo_YYYY-MM-DD.log (daily rotation)
• Rotation: Midnight rotation, retains 14 days (configurable via LOG_RETENTION)
• Max Size: 10 MB per file before rotation

Strategy Logs

• Location: openalgo/strategies/logs/ or openalgo/log/strategies/
• Pattern: {strategy_id}_*.log
• Access: Web UI at /python/logs/<strategy_id>
• Reports: strategy_report_*.txt for daily summaries

Web UI Logs

• Endpoint: /logs (filterable, searchable)
• Streaming: SSE endpoint for real-time log streaming

Monitoring Workflow

1. Check Log Status

# List all log files with sizes
find openalgo/log -name "*.log*" -type f -exec ls -lh {} \;
find openalgo/strategies/logs -name "*.log" -type f -exec ls -lh {} \;

# Check current log file size
ls -lh openalgo/log/openalgo_*.log | tail -1

# Count log files
find openalgo/log -name "*.log*" | wc -l

2. Monitor Logs in Real-Time

# System logs (follow latest)
tail -f openalgo/log/openalgo_$(date +%Y-%m-%d).log

# Strategy-specific log
tail -f openalgo/strategies/logs/{strategy_id}_*.log

# Multiple logs simultaneously
tail -f openalgo/log/openalgo_*.log openalgo/strategies/logs/*.log

# Last N lines then follow
tail -n 100 -f openalgo/log/openalgo_*.log

3. Watch for Errors

# Monitor for errors in real-time
tail -f openalgo/log/openalgo_*.log | grep -iE "ERROR|WARNING|CRITICAL|exception|traceback"

# Monitor specific strategy for errors
tail -f openalgo/strategies/logs/{strategy_id}_*.log | grep -iE "ERROR|403|429|400"

# Count errors in recent logs
grep -iE "ERROR|CRITICAL" openalgo/log/openalgo_*.log | wc -l

4. Check Log Health

# Verify log rotation is working
ls -lh openalgo/log/openalgo_*.log | tail -5

# Check if logs are being written (recent modification)
find openalgo/log -name "*.log" -mmin -5

# Verify log directory permissions
ls -ld openalgo/log openalgo/strategies/logs

# Check disk space used by logs
du -sh openalgo/log openalgo/strategies/logs

Common Monitoring Patterns

Monitor All Active Strategies

# Find all active strategy log files
find openalgo/strategies/logs -name "*.log" -mmin -60 -type f

# Monitor all active strategy logs
find openalgo/strategies/logs -name "*.log" -mmin -60 -type f -exec tail -f {} +

Track Log Growth

# Watch log file size growth
watch -n 5 'ls -lh openalgo/log/openalgo_*.log | tail -1'

# Check which logs are growing fastest
find openalgo/log openalgo/strategies/logs -name "*.log" -type f -exec sh -c 'echo "$(du -h "$1" | cut -f1) $1"' _ {} \; | sort -hr | head -10

Monitor Log Rotation

# Check rotation status
ls -lh openalgo/log/openalgo_*.log | tail -15

# Verify rotation count matches retention setting
ls openalgo/log/openalgo_*.log* | wc -l

Log Monitoring Scripts

Quick Status Check

#!/bin/bash
# Check current log status
echo "=== System Logs ==="
ls -lh openalgo/log/openalgo_*.log | tail -3
echo ""
echo "=== Strategy Logs ==="
find openalgo/strategies/logs -name "*.log" -mmin -60 -type f | head -10
echo ""
echo "=== Recent Errors ==="
grep -iE "ERROR|CRITICAL" openalgo/log/openalgo_$(date +%Y-%m-%d).log | tail -5

Continuous Monitoring

#!/bin/bash
# Monitor logs with error highlighting
tail -f openalgo/log/openalgo_$(date +%Y-%m-%d).log | \
  while IFS= read -r line; do
    if echo "$line" | grep -qiE "ERROR|CRITICAL"; then
      echo -e "\033[31m$line\033[0m"  # Red for errors
    elif echo "$line" | grep -qiE "WARNING"; then
      echo -e "\033[33m$line\033[0m"  # Yellow for warnings
    else
      echo "$line"
    fi
  done

Web UI Monitoring

• Log Viewer: Access at http://localhost:5000/logs
• Strategy Logs: Access at http://localhost:5000/python/logs/<strategy_id>
• Features: Filter by level, search, date range, download

Monitoring Best Practices

1. Check log rotation: Ensure logs rotate properly and don't fill disk
2. Monitor error rates: Track ERROR/CRITICAL frequency over time
3. Watch file sizes: Alert if logs exceed expected sizes
4. Verify write access: Ensure processes can write to log directories
5. Track log growth: Monitor disk space usage by logs
6. Check timestamps: Verify logs are being written recently

Output Format

When monitoring logs, provide:

1. Current Status: Active log files and their sizes
2. Recent Activity: Last modification times
3. Error Summary: Count of recent errors/warnings
4. Health Check: Rotation status, disk usage, permissions
5. Recommendations: Any issues or optimizations needed

Integration with Other Skills

• Use log-analyzer for detailed error analysis
• Use log-drain-monitor for observability stack setup
• Use trading-operations for strategy-specific log monitoring