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Add macOS-compatible Node Exporter Grafana dashboard (#8)

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## Summary
- Adds a new Grafana dashboard for Node Exporter metrics on macOS hosts
- Uses macOS-native memory metrics (node_memory_total_bytes, node_memory_active_bytes, etc.) instead of Linux-specific ones
- Includes dropdown selectors for instance, disk, and network device filtering

## Details
The standard Node Exporter dashboards show "No Data" for memory panels on macOS because they query Linux-specific metrics like `node_memory_MemTotal_bytes`. macOS node_exporter exports different metrics:

| Linux | macOS |
|-------|-------|
| node_memory_MemTotal_bytes | node_memory_total_bytes |
| node_memory_MemFree_bytes | node_memory_free_bytes |
| node_memory_Buffers_bytes | (not available) |
| node_memory_Cached_bytes | (not available) |

macOS has unique memory categories: Wired, Active, Compressed, Inactive, Free.

## Test plan
- [x] Dashboard deployed to indri via ansible
- [x] All panels showing data for indri
- [x] Instance selector works to switch between hosts
- [x] Disk and network device filters work

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Reviewed-on: https://forge.tail8d86e.ts.net/eblume/blumeops/pulls/8
This commit is contained in:
Erich Blume 2026-01-14 20:53:57 -08:00
commit 50c713b5de
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