[inputs.turbostat] Interval cannot be less than 1s

[NiccoloTosato]

Relevant telegraf.conf

[[inputs.turbostat]]
  interval = "500ms"

Logs from Telegraf

# ./telegraf --debug  --config ../telegraf.conf
2025-11-06T16:00:38Z I! Loading config: ../telegraf.conf
2025-11-06T16:00:38Z I! Starting Telegraf 1.36.3 brought to you by InfluxData the makers of InfluxDB
2025-11-06T16:00:38Z I! Available plugins: 239 inputs, 9 aggregators, 35 processors, 26 parsers, 65 outputs, 6 secret-stores
2025-11-06T16:00:38Z I! Loaded inputs: cpu diskio exec infiniband linux_cpu mem net turbostat
2025-11-06T16:00:38Z I! Loaded aggregators:
2025-11-06T16:00:38Z I! Loaded processors:
2025-11-06T16:00:38Z I! Loaded secretstores:
2025-11-06T16:00:38Z I! Loaded outputs: http
2025-11-06T16:00:38Z I! Tags enabled: host=compute001
2025-11-06T16:00:38Z I! [agent] Config: Interval:1s, Quiet:false, Hostname:"compute001", Flush Interval:10s
2025-11-06T16:00:38Z W! [agent] The default value of 'skip_processors_after_aggregators' will change to 'true' with Telegraf v1.40.0! If you need the current default behavior, please explicitly set the option to 'false'!
2025-11-06T16:00:38Z D! [agent] Initializing plugins
2025-11-06T16:00:38Z D! [agent] Connecting outputs
2025-11-06T16:00:38Z D! [agent] Attempting connection to [outputs.http]
2025-11-06T16:00:38Z D! [agent] Successfully connected to outputs.http
2025-11-06T16:00:38Z D! [agent] Starting service inputs
2025-11-06T16:00:38Z I! [inputs.turbostat] Starting process: turbostat [--quiet --interval 0 --show all]
2025-11-06T16:00:38Z E! [inputs.turbostat] Error in plugin: interval 0.000000 seconds is too small
2025-11-06T16:00:38Z E! [inputs.turbostat] Process /usr/bin/turbostat exited: exit status 2
2025-11-06T16:00:38Z I! [inputs.turbostat] Restarting in 5s...
2025-11-06T16:00:43Z I! [inputs.turbostat] Starting process: turbostat [--quiet --interval 0 --show all]
2025-11-06T16:00:43Z E! [inputs.turbostat] Error in plugin: interval 0.000000 seconds is too small
2025-11-06T16:00:43Z E! [inputs.turbostat] Process /usr/bin/turbostat exited: exit status 2
2025-11-06T16:00:43Z I! [inputs.turbostat] Restarting in 5s...
^C2025-11-06T16:00:43Z D! [agent] Stopping service inputs

System info

Telegraf 1.36.3, Fedora Linux 42 (Adams), turbostat version 2025.02.02

Docker

No response

Steps to reproduce

1. Set interval = "500ms" in place of interval = 1s
2. Run telegraf

Expected behavior

I expect that interval is ignored since the documentation reports The global or plugin specific interval setting may not apply. If the interval is not ignored, I expect it to be honored.

Actual behavior

While setting 500ms as an interval, the turbostat process receives an interval of 0.

2025-11-06T16:00:38Z I! [inputs.turbostat] Starting process: turbostat [--quiet --interval 0 --show all]
2025-11-06T16:00:38Z E! [inputs.turbostat] Error in plugin: interval 0.000000 seconds is too small

Additional info

What happens is that in the code, the interval is rounded as an Integer, then 500ms is passed to turbostat as zero.

s := int(time.Duration(t.Interval).Seconds())
t.command = append(t.command, t.Path, "--quiet", "--interval", strconv.Itoa(s), "--show", "all")

turbostat accepts the following interval format: -i, --interval sec.subsec. This means that it is possible to adopt non-integer values (e.g float).