Hello everyone We just upgraded FluentBit using the latest H Fluent Community #fluent-bit

Hello everyone. We just upgraded FluentBit using ...

KimJohn Quinn

10/26/2025, 1:44 PM

Hello everyone. We just upgraded FluentBit using the latest Helm chart in Artifact hub and in both our environments we are seeing this error in our logs:

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[input:node_exporter_metrics:node_metrics] read error, check permissions: /sys/class/hwmon/hwmon*

It says this is benign and trying to get "temperature" metrics (which we just introduced a node group for Nvida instances). The configuration for the input is pretty basic

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[INPUT]
        Alias                           node_metrics
        name                            node_exporter_metrics
        tag                             node_metrics
        scrape_interval                 60

Can I disable this somehow? It is flooding out logs.

Pat

10/26/2025, 1:50 PM

@hhatake may know more around disabling it directly but I suspect you can customise the scrape interval for that specific collector to be really long to stop it flooding logs? https://docs.fluentbit.io/manual/data-pipeline/inputs/node-exporter-metrics#configuration

KimJohn Quinn

10/26/2025, 1:51 PM

but which "metric" is it? I dont necessarily want to stop all the metrics, just this one.

Pat

10/26/2025, 1:53 PM

grepping the code shows it comes from here: https://github.com/fluent/fluent-bit/blob/master/plugins/in_node_exporter_metrics/ne_hwmon_linux.h

Pat

10/26/2025, 1:55 PM

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$ docker run --rm -it fluent/fluent-bit -i node_exporter_metrics --help
...
collector.hwmon.chip-include             regex of chips to include
                                         > default: default, type: string

collector.hwmon.chip-exclude             regex of chips to exclude
                                         > default: default, type: string

collector.hwmon.sensor-include           regex of sensors to include
                                         > default: default, type: string

collector.hwmon.sensor-exclude           regex of sensors to exclude
                                         > default: default, type: string

Looks like there are a few options for the

hwmon

collector - not documented yet it seems - so maybe the scrape interval for that or you can adjust those exclude regexes to cover everything? I presume you don't want to just fix the mounts?

KimJohn Quinn

10/26/2025, 1:55 PM

yeah. or roll back might be the easier one for now ;(

KimJohn Quinn

10/26/2025, 1:58 PM

Do you know what version that was introduced (4.1.0?)

Pat

10/26/2025, 1:58 PM

Up to you but I'd still raise an issue on it - it needs the docs updating at least to show it. I suspect you need to specify the regexes appropriately if you do not want to use it.

Pat

10/26/2025, 1:58 PM

Look at the code, you can see what it was added

KimJohn Quinn

10/26/2025, 1:58 PM

ill def raise the issue but for now looking at the quickest path

Pat

10/26/2025, 1:59 PM

Looks like it is in 4.1 only: https://github.com/fluent/fluent-bit/commit/e7aba68b174f482d08ba44b1ca0192ad010939c9

KimJohn Quinn

10/26/2025, 1:59 PM

Nice. Thank you so much for the quick reply! I really appreciate it.

👍 2

Pat

10/26/2025, 2:14 PM

To be honest it's probably quicker to just push a PR for the docs if you want to get the missing ones in: https://github.com/fluent/fluent-bit-docs/blob/master/pipeline/inputs/node-exporter-metrics.md I know @Eric D. Schabell has been trying to stay on top of the changes here but it's always possible some slip through.

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