bryancall opened a new pull request, #12847:
URL: https://github.com/apache/trafficserver/pull/12847
## Summary
A Python tool that displays ATS metrics inline in iTerm2 using imgcat with
live updates and multi-host comparison.
**Features:**
- Real-time graphs of RPS, latency, cache hit rate, connections
- Support for 1-4 hosts with different line styles for comparison
- Collects metrics via JSONRPC Unix socket (batch collection)
- Dark theme optimized for terminal display
- Keyboard navigation between metric pages (4 pages)
- Configurable refresh interval and history window
**Requirements:**
- Python 3 with matplotlib
- iTerm2 (or compatible terminal for inline images)
- SSH access to remote ATS hosts
**Usage:**
```bash
traffic_grapher.py ats-server1.example.com
traffic_grapher.py ats{1..4}.example.com --interval 2
```
## Test plan
- [x] Tested with 1, 2, 3, and 4 hosts
- [x] Verified all 4 metric pages display correctly
- [x] Confirmed keyboard navigation (h/l, left/right arrows)
- [x] Tested with --save-png for offline verification
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