Bug? Logical Disk Performance counter ingest NULL instead of Zero (0)

Andre_ — Wed, 26 Nov 2025 04:17:16 GMT

Hello,

we encountered a situation today where a monitored Windows Drive disappeared from Spunk.

The drive had become completely full, 0 bytes free and 0% free space.

|mstats -> drive does show up in results anymore

We've reproduced the issue in a lab and every time the disk goes to 0 it disappears.
We've compared the performance counters in the metric index with what powershell shows locally using get-counter. Powershell returns 0 (not NULL)

Looking at available perfmon counters for logical disk, we found one counter that has a not 0 value "% Idle Time" - we've added that to the inputs.conf and mstats SPL

Once this was complete we could see that all other fields for the disk with 0 bytes free were NULL instead of 0 (Zero)

"% Free Space" and ""Free Megabytes" should be 0 (zero) not NULL when they are 0

Anyone else had this issue before?

Kind Regards

Andre

Re: Bug? Logical Disk Performance counter ingest NULL instead of Zero (0)

Andre_ — Tue, 02 Dec 2025 09:27:16 GMT

Not a bug.

opened a support case and there is a showZeroValue = 1 option for the inputs.conf stanza.

Default is 0, once set to 1, Zero Values are being recorded as 0.

topic Bug? Logical Disk Performance counter ingest NULL instead of Zero (0) in Getting Data In

Bug? Logical Disk Performance counter ingest NULL instead of Zero (0)

Re: Bug? Logical Disk Performance counter ingest NULL instead of Zero (0)