Log Error Digest
Automated log file analysis that produces error clustering, frequency statistics, and time distribution reports.
Features
- Error Clustering: Groups similar error messages by normalizing dynamic parts (IPs, UUIDs, numbers, etc.) to identify root causes
- Frequency Statistics: Counts occurrences by error type, sorted by severity
- Time Distribution: Shows error distribution by hour and by date, helping pinpoint peak error periods
Supported Log Formats
| Format | Description | Auto-detection |
|---|---|---|
| JSON | One JSON object per line with timestamp/level/message fields | Starts with { |
| syslog | RFC 3164 format, e.g. Jan 1 12:00:00 host proc[pid]: msg | Starts with month name |
| Nginx | Access log or error log format | Starts with IP or date/path pattern |
Usage
bashpython scripts/analyze_logs.py <log_file_path> [options]
Parameters
| Parameter | Description | Default |
|---|---|---|
log_file | Path to the log file (required) | - |
--format | Log format: auto/json/syslog/nginx | auto |
--top | Show Top N error clusters | 20 |
--output | Export results to a JSON file | Terminal output only |
--level | Filter by log level (e.g. ERROR, WARN) | All levels |
--since | Only analyze logs after this time (ISO format) | No limit |
--until | Only analyze logs before this time (ISO format) | No limit |
Examples
bash# Auto-detect format and analyze the entire log file python scripts/analyze_logs.py /var/log/app.log # Specify Nginx format, show only Top 10 errors python scripts/analyze_logs.py /var/log/nginx/error.log --format nginx --top 10 # Filter ERROR level only, export JSON report python scripts/analyze_logs.py app.log --level ERROR --output report.json # Analyze logs within a specific time range python scripts/analyze_logs.py app.log --since 2024-01-01T00:00:00 --until 2024-01-02T00:00:00
Output
Terminal Output
======================================================= Log Analysis Report ======================================================= 📊 Overview Detected format: json Total lines: 15,234 Parsed: 15,100 (parse failures: 134) Matched entries: 12,800 Errors: 2,341 Time range: 2024-01-01 00:03:12 ~ 2024-01-01 23:58:45 🔴 Top Error Clusters (47 total) #1 [×523 ] Connection refused to database at 10.0.1.5:5432 First seen: 2024-01-01T00:15:30 Last seen: 2024-01-01T23:45:12 #2 [×312 ] Timeout waiting for response from user-service after 30000ms First seen: 2024-01-01T02:10:00 Last seen: 2024-01-01T22:30:45 #3 [×198 ] File not found: /data/uploads/img_99421.png First seen: 2024-01-01T08:00:00 Last seen: 2024-01-01T20:15:33 ... ⏰ Time Distribution (by hour) 00:00 █████░░░░░░░░░░░░░░░ 42 01:00 ██░░░░░░░░░░░░░░░░░░ 18 ... 14:00 ████████████████████ 523 ... 📅 Time Distribution (by date) 2024-01-01 ████████████████████ 2,341
JSON Output
Use the --output parameter to export a structured JSON report for further processing or integration with monitoring systems.
