Report available fields if utmp is unreadable (#4043)

(cherry picked from commit 120be7e87b)
This commit is contained in:
Daniel Nelson 2018-04-18 16:55:18 -07:00 committed by Daniel Nelson
parent cdc40783d5
commit 6081bd0b5f
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2 changed files with 34 additions and 32 deletions

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@ -1,8 +1,7 @@
# System Input Plugin
The system plugin gathers general stats on system load, uptime,
and number of users logged in. It is basically equivalent
to the unix `uptime` command.
and number of users logged in. It is similar to the unix `uptime` command.
### Configuration:
@ -11,10 +10,15 @@ to the unix `uptime` command.
[[inputs.system]]
# no configuration
```
#### Permissions:
### Measurements & Fields:
The `n_users` field requires read access to `/var/run/utmp`, and may require
the `telegraf` user to be added to the `utmp` group on some systems.
### Metrics:
- system
- fields:
- load1 (float)
- load15 (float)
- load5 (float)
@ -23,17 +27,10 @@ to the unix `uptime` command.
- uptime (integer, seconds)
- uptime_format (string)
### Tags:
None
### Example Output:
```
$ telegraf --config ~/ws/telegraf.conf --input-filter system --test
* Plugin: system, Collection 1
* Plugin: inputs.system, Collection 1
> system,host=tyrion load1=3.72,load5=2.4,load15=2.1,n_users=3i,n_cpus=4i 1483964144000000000
> system,host=tyrion uptime=1249632i 1483964144000000000
> system,host=tyrion uptime_format="14 days, 11:07" 1483964144000000000
system,host=tyrion load1=3.72,load5=2.4,load15=2.1,n_users=3i,n_cpus=4i 1483964144000000000
system,host=tyrion uptime=1249632i 1483964144000000000
system,host=tyrion uptime_format="14 days, 11:07" 1483964144000000000
```

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@ -4,6 +4,7 @@ import (
"bufio"
"bytes"
"fmt"
"os"
"runtime"
"strings"
@ -28,23 +29,27 @@ func (_ *SystemStats) Gather(acc telegraf.Accumulator) error {
return err
}
fields := map[string]interface{}{
"load1": loadavg.Load1,
"load5": loadavg.Load5,
"load15": loadavg.Load15,
"n_cpus": runtime.NumCPU(),
}
users, err := host.Users()
if err == nil {
fields["n_users"] = len(users)
} else if !os.IsPermission(err) {
return err
}
acc.AddGauge("system", fields, nil)
hostinfo, err := host.Info()
if err != nil {
return err
}
users, err := host.Users()
if err != nil {
return err
}
acc.AddGauge("system", map[string]interface{}{
"load1": loadavg.Load1,
"load5": loadavg.Load5,
"load15": loadavg.Load15,
"n_users": len(users),
"n_cpus": runtime.NumCPU(),
}, nil)
acc.AddCounter("system", map[string]interface{}{
"uptime": hostinfo.Uptime,
}, nil)