createMDTChangelogUsersMetrics error after each metrics query

[chadgent]

Is anyone else having this issue using this exporter? After compiling every time I query /metrics it generates the below error.

source "lctl" failed after x seconds - github.com/GSI-HPC/lustre_exporter/sources.(*lustreLctlSource).createMDTChangelogUsersMetrics-fm - exit status2

We query metrics every 15 seconds so this tends to fill up our log files.

Thanks

[gabrieleiannetti]

Hi @chadgent,

indeed, the exporter lacks on documentation about which metrics are exported when...

As the metric MDTChangelogUsersMetrics implies, it is about the Metadata Target - Changelog Users.

This means, the processing of that metric has been activated for that proper collector collector.mdt (more technically it is --collector.mdt=extended).

If you are running the exporter on a non Metadata Server you should deactivate that collector with --collector.mdt=disable. I would suggest just to activate the proper collector for that Lustre machine type. The exporter does not recognize the machine type by itself and also will not know how detailed a collector should export metrics.

Please refer to the Running Flags of the exporter.

Indeed, the default for all running flags for collectors is set to extended.
That will trigger the error on non Lustre MDS machines.

I will create an separate issue for improving that situation here and link to this one.

Best
Gabriele

[chadgent]

Sounds good and thanks for the follow up.

[severgun]

I have same error on MDS node.