telegraf/plugins/inputs/interrupts/README.md

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# Interrupts Input Plugin
The interrupts plugin gathers metrics about IRQs from `/proc/interrupts` and `/proc/softirqs`.
### Configuration
```toml
[[inputs.interrupts]]
## When set to true, cpu metrics are tagged with the cpu. Otherwise cpu is
## stored as a field.
##
## The default is false for backwards compatibility, and will be changed to
## true in a future version. It is recommended to set to true on new
## deployments.
# cpu_as_tag = false
## To filter which IRQs to collect, make use of tagpass / tagdrop, i.e.
# [inputs.interrupts.tagdrop]
# irq = [ "NET_RX", "TASKLET" ]
```
### Metrics
There are two styles depending on the value of `cpu_as_tag`.
With `cpu_as_tag = false`:
- interrupts
- tags:
- irq (IRQ name)
- type
- device (name of the device that is located at the IRQ)
- cpu
- fields:
- cpu (int, number of interrupts per cpu)
- total (int, total number of interrupts)
- soft_interrupts
- tags:
- irq (IRQ name)
- type
- device (name of the device that is located at the IRQ)
- cpu
- fields:
- cpu (int, number of interrupts per cpu)
- total (int, total number of interrupts)
With `cpu_as_tag = true`:
- interrupts
- tags:
- irq (IRQ name)
- type
- device (name of the device that is located at the IRQ)
- cpu
- fields:
- count (int, number of interrupts)
- soft_interrupts
- tags:
- irq (IRQ name)
- type
- device (name of the device that is located at the IRQ)
- cpu
- fields:
- count (int, number of interrupts)
### Example Output
With `cpu_as_tag = false`:
```
interrupts,irq=0,type=IO-APIC,device=2-edge\ timer,cpu=cpu0 count=23i 1489346531000000000
interrupts,irq=1,type=IO-APIC,device=1-edge\ i8042,cpu=cpu0 count=9i 1489346531000000000
interrupts,irq=30,type=PCI-MSI,device=65537-edge\ virtio1-input.0,cpu=cpu1 count=1i 1489346531000000000
soft_interrupts,irq=NET_RX,cpu=cpu0 count=280879i 1489346531000000000
```
With `cpu_as_tag = true`:
```
interrupts,cpu=cpu6,irq=PIW,type=Posted-interrupt\ wakeup\ event count=0i 1543539773000000000
interrupts,cpu=cpu7,irq=PIW,type=Posted-interrupt\ wakeup\ event count=0i 1543539773000000000
soft_interrupts,cpu=cpu0,irq=HI count=246441i 1543539773000000000
soft_interrupts,cpu=cpu1,irq=HI count=159154i 1543539773000000000
```