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20 changes: 20 additions & 0 deletions README.md
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Expand Up @@ -150,6 +150,26 @@ These are examples of rules you can use with Prometheus to trigger the firing of

---

**Disk Will Fill in 2 weeks -- Less jumpy version**
```yaml
- alert: PreditciveHostDiskSpace
expr: predict_linear(node_filesystem_free{fstype!="tmpfs"}[1w], 3600 * 24 * 2w) < 0
for: 1d
labels:
severity: warning
annotations:
description: Device {{$labels.device}} mounted at {{ $labels.mountpoint }} on
node {{$labels.instance}} likely to fill within the next 4 hours.
summary: Predictive Disk Space Utilisation Alert
```
*Summary:* This is meant to catch a gradually filling disk,
while not alerting on backups, log rotation, etc.
It looks at all filesystems, not just root, but skips `tmpfs`.

*Inspiration:* [Circonus Blog](https://www.circonus.com/2014/11/alerting-on-disk-space-the-right-way/)

---

**Alert on High Memory Load**
```yaml
- expr: (sum(node_memory_MemTotal) - sum(node_memory_MemFree + node_memory_Buffers + node_memory_Cached) ) / sum(node_memory_MemTotal) * 100 > 85
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