dirless-probe

A tiny Crystal binary that reports a backend node's hardware/health as a single JSON line on stdout: CPU count, total/free memory (MB), 5-minute load average, and total/free disk (GB) for /.

The Dirless ops machine deploys this to each backend node and runs it over SSH to collect node metrics (see dirless-infra's backend.yml and just build-probe).

Build

shards install
shards build --release --static   # → bin/dirless-probe

Output

{"cpu_count":2,"total_memory_mb":1024,"free_memory_mb":640,"load_5m":0.12,"total_disk_gb":40,"free_disk_gb":31}