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add metrics for process stats

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Tested on a COS VM:

```
$ curl -s localhost:20257/metrics | grep "^system_"
system_interrupts_total{kernel_version="5.4.49+",os_version="cos 85-13310.1041.24"} 8.759236e+07
system_processes_total{kernel_version="5.4.49+",os_version="cos 85-13310.1041.24"} 692506
system_procs_blocked{kernel_version="5.4.49+",os_version="cos 85-13310.1041.24"} 0
system_procs_running{kernel_version="5.4.49+",os_version="cos 85-13310.1041.24"} 2
```
This commit is contained in:
Karan Goel
2021-01-13 09:14:08 -08:00
parent b951f24297
commit 71098097c0
7 changed files with 132 additions and 8 deletions
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pkg/systemstatsmonitor/README.md
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@@ -28,6 +28,10 @@ Below metrics are collected from `cpu` component:
* `cpu_load_1m`: CPU load average over the last 1 minute. Collected from [`/proc/loadavg`][/proc doc].
* `cpu_load_5m`: CPU load average over the last 5 minutes. Collected from [`/proc/loadavg`][/proc doc].
* `cpu_load_15m`: CPU load average over the last 15 minutes. Collected from [`/proc/loadavg`][/proc doc].
* `system/processes_total`: Number of forks since boot.
* `system/procs_running`: Number of processes currently running.
* `system/procs_blocked`: Number of processes currently blocked.
* `system/interrupts_total`: Total number of interrupts serviced (cumulative).
[/proc doc]: http://man7.org/linux/man-pages/man5/proc.5.html