prometheus: have different disk alerts for physical and virtual hosts
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.
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@ -44,22 +44,39 @@ groups:
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annotations:
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summary: Host unusual network throughput out (instance {{ $labels.instance }})
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description: "Host network interfaces are probably sending too much data (> 100 MB/s)\n VALUE = {{ $value }}"
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- alert: HostUnusualDiskReadRate
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expr: (sum by (instance) (rate(node_disk_read_bytes_total[2m])) / 1024 / 1024 > 50) * on(instance) group_left (nodename) node_uname_info{nodename=~".+"}
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# Have different disk read and write rate alerts for VMs and physical machines.
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- alert: VirtualHostUnusualDiskReadRate
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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=~".+"}
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for: 5m
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labels:
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severity: warning
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annotations:
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summary: Host unusual disk read rate (instance {{ $labels.instance }})
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summary: Virtual host unusual disk read rate (instance {{ $labels.instance }})
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description: "Disk is probably reading too much data (> 50 MB/s)\n VALUE = {{ $value }}"
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- alert: HostUnusualDiskWriteRate
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expr: (sum by (instance) (rate(node_disk_written_bytes_total[2m])) / 1024 / 1024 > 50) * on(instance) group_left (nodename) node_uname_info{nodename=~".+"}
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- alert: VirtualHostUnusualDiskWriteRate
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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=~".+"}
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for: 2m
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labels:
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severity: warning
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annotations:
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summary: Host unusual disk write rate (instance {{ $labels.instance }})
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summary: Virtual host unusual disk write rate (instance {{ $labels.instance }})
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description: "Disk is probably writing too much data (> 50 MB/s)\n VALUE = {{ $value }}"
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- alert: PhysicalHostUnusualDiskReadRate
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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=~".+"}
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for: 20m
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labels:
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severity: warning
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annotations:
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summary: Physical host unusual disk read rate (instance {{ $labels.instance }})
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description: "Disk is probably reading too much data (> 100 MB/s)\n VALUE = {{ $value }}"
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- alert: PhysicalHostUnusualDiskWriteRate
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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=~".+"}
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for: 15m
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labels:
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severity: warning
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annotations:
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summary: Physical host unusual disk write rate (instance {{ $labels.instance }})
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description: "Disk is probably writing too much data (> 100 MB/s)\n VALUE = {{ $value }}"
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# Please add ignored mountpoints in node_exporter parameters like
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# "--collector.filesystem.ignored-mount-points=^/(sys|proc|dev|run)($|/)".
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# Same rule using "node_filesystem_free_bytes" will fire when disk fills for non-root users.
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@ -156,13 +173,30 @@ groups:
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annotations:
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summary: Host CPU high iowait (instance {{ $labels.instance }})
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description: "CPU iowait > 10%. A high iowait means that you are disk or network bound.\n VALUE = {{ $value }}"
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- alert: HostUnusualDiskIo
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expr: (rate(node_disk_io_time_seconds_total[1m]) > 0.5) * on(instance) group_left (nodename) node_uname_info{nodename=~".+"}
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# Have different disk IO alerts for VMs and physical machines and for physical machines different ones for hard and other disks.
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- alert: PhysicalHostUnusualHardDiskIo
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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=~".+"}
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for: 5m
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labels:
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severity: warning
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annotations:
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summary: Host unusual disk IO (instance {{ $labels.instance }})
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summary: Physical host unusual hard disk IO (instance {{ $labels.instance }})
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description: "Time spent in IO is too high on {{ $labels.instance }}. Check storage for issues.\n VALUE = {{ $value }}"
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- alert: PhysicalHostUnusualOtherDiskIo
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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=~".+"}
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for: 5m
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labels:
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severity: warning
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annotations:
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summary: Physical host unusual other (non-hard) disk IO (instance {{ $labels.instance }})
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description: "Time spent in IO is too high on {{ $labels.instance }}. Check storage for issues.\n VALUE = {{ $value }}"
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- alert: VirtualHostUnusualDiskIo
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expr: (rate(node_disk_io_time_seconds_total[1m]) > 0.5) * on(instance) group_left (nodename) node_uname_info{type="virtual_machine", nodename=~".+"}
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for: 5m
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labels:
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severity: warning
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annotations:
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summary: Virtual host unusual disk IO (instance {{ $labels.instance }})
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description: "Time spent in IO is too high on {{ $labels.instance }}. Check storage for issues.\n VALUE = {{ $value }}"
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# # x2 context switches is an arbitrary number.
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# # The alert threshold depends on the nature of the application.
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