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prometheus: have different disk alerts for physical and virtual hosts

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Have more relaxed read/write alerts for physical hosts as they are
probably hypervisors and regular high read/writes are more common.
Also differentiate between physical and virtual hosts for IO alerts and
allow for hard disks to spend more time in IO.
This commit is contained in:
June 2024-10-05 17:17:35 +02:00
parent f721dd9fea
commit 4cac84e7ec
Signed by: june
SSH key fingerprint: SHA256:o9EAq4Y9N9K0pBQeBTqhSDrND5E7oB+60ZNx0U1yPe0
1 changed files with 43 additions and 9 deletions
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52
playbooks/files/chaosknoten/configs/grafana/docker_compose/prometheus_alerts.rules.yaml
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@ -44,22 +44,39 @@ groups:
annotations:
summary: Host unusual network throughput out (instance {{ $labels.instance }})
description: "Host network interfaces are probably sending too much data (> 100 MB/s)\n VALUE = {{ $value }}"
- alert: HostUnusualDiskReadRate
expr: (sum by (instance) (rate(node_disk_read_bytes_total[2m])) / 1024 / 1024 > 50) * on(instance) group_left (nodename) node_uname_info{nodename=~".+"}
# Have different disk read and write rate alerts for VMs and physical machines.
- alert: VirtualHostUnusualDiskReadRate
expr: (sum by (instance) (rate(node_disk_read_bytes_total[2m])) / 1024 / 1024 > 50) * on(instance) group_left (nodename) node_uname_info{ype="virtual_machine", nodename=~".+"}
for: 5m
labels:
severity: warning
annotations:
summary: Host unusual disk read rate (instance {{ $labels.instance }})
summary: Virtual host unusual disk read rate (instance {{ $labels.instance }})
description: "Disk is probably reading too much data (> 50 MB/s)\n VALUE = {{ $value }}"
- alert: HostUnusualDiskWriteRate
expr: (sum by (instance) (rate(node_disk_written_bytes_total[2m])) / 1024 / 1024 > 50) * on(instance) group_left (nodename) node_uname_info{nodename=~".+"}
- alert: VirtualHostUnusualDiskWriteRate
expr: (sum by (instance) (rate(node_disk_written_bytes_total[2m])) / 1024 / 1024 > 50) * on(instance) group_left (nodename) node_uname_info{type="virtual_machine", nodename=~".+"}
for: 2m
labels:
severity: warning
annotations:
summary: Host unusual disk write rate (instance {{ $labels.instance }})
summary: Virtual host unusual disk write rate (instance {{ $labels.instance }})
description: "Disk is probably writing too much data (> 50 MB/s)\n VALUE = {{ $value }}"
- alert: PhysicalHostUnusualDiskReadRate
expr: (sum by (instance) (rate(node_disk_read_bytes_total[2m])) / 1024 / 1024 > 100) * on(instance) group_left (nodename) node_uname_info{type="physical_machine", nodename=~".+"}
for: 20m
labels:
severity: warning
annotations:
summary: Physical host unusual disk read rate (instance {{ $labels.instance }})
description: "Disk is probably reading too much data (> 100 MB/s)\n VALUE = {{ $value }}"
- alert: PhysicalHostUnusualDiskWriteRate
expr: (sum by (instance) (rate(node_disk_written_bytes_total[2m])) / 1024 / 1024 > 100) * on(instance) group_left (nodename) node_uname_info{type="physical_machine", nodename=~".+"}
for: 15m
labels:
severity: warning
annotations:
summary: Physical host unusual disk write rate (instance {{ $labels.instance }})
description: "Disk is probably writing too much data (> 100 MB/s)\n VALUE = {{ $value }}"
# Please add ignored mountpoints in node_exporter parameters like
# "--collector.filesystem.ignored-mount-points=^/(sys|proc|dev|run)($|/)".
# Same rule using "node_filesystem_free_bytes" will fire when disk fills for non-root users.
@ -156,13 +173,30 @@ groups:
annotations:
summary: Host CPU high iowait (instance {{ $labels.instance }})
description: "CPU iowait > 10%. A high iowait means that you are disk or network bound.\n VALUE = {{ $value }}"
- alert: HostUnusualDiskIo
expr: (rate(node_disk_io_time_seconds_total[1m]) > 0.5) * on(instance) group_left (nodename) node_uname_info{nodename=~".+"}
# Have different disk IO alerts for VMs and physical machines and for physical machines different ones for hard and other disks.
- alert: PhysicalHostUnusualHardDiskIo
expr: (rate(node_disk_io_time_seconds_total{device=~"s.+"}[1m]) > 0.75) * on(instance) group_left (nodename) node_uname_info{type="physical_machine", nodename=~".+"}
for: 5m
labels:
severity: warning
annotations:
summary: Host unusual disk IO (instance {{ $labels.instance }})
summary: Physical host unusual hard disk IO (instance {{ $labels.instance }})
description: "Time spent in IO is too high on {{ $labels.instance }}. Check storage for issues.\n VALUE = {{ $value }}"
- alert: PhysicalHostUnusualOtherDiskIo
expr: (rate(node_disk_io_time_seconds_total{device!~"s.+"}[1m]) > 0.5) * on(instance) group_left (nodename) node_uname_info{type="physical_machine", nodename=~".+"}
for: 5m
labels:
severity: warning
annotations:
summary: Physical host unusual other (non-hard) disk IO (instance {{ $labels.instance }})
description: "Time spent in IO is too high on {{ $labels.instance }}. Check storage for issues.\n VALUE = {{ $value }}"
- alert: VirtualHostUnusualDiskIo
expr: (rate(node_disk_io_time_seconds_total[1m]) > 0.5) * on(instance) group_left (nodename) node_uname_info{type="virtual_machine", nodename=~".+"}
for: 5m
labels:
severity: warning
annotations:
summary: Virtual host unusual disk IO (instance {{ $labels.instance }})
description: "Time spent in IO is too high on {{ $labels.instance }}. Check storage for issues.\n VALUE = {{ $value }}"
# # x2 context switches is an arbitrary number.
# # The alert threshold depends on the nature of the application.