Disk free metric of windows_exporter_metrics stops updating

[HerrBlauwasser]

Bug Report

Describe the bug

When using the windows_exporter_metrics plugin, the windows_logical_disk_free_megabytes{volume="C:"} metric seems to stop updating a few minutes after starting fluent-bit. From that moment on, this metric is always reported with the same timestamp. This looks then for example like this (see middle line):

[...]
2023-05-29T10:05:49.084438000Z windows_logical_disk_read_seconds_total{volume="HarddiskVolume1"} = 1.3329828349090552e+17
2023-05-29T10:05:49.084438000Z windows_logical_disk_write_seconds_total{volume="C:"} = 1.3329828349090552e+17
2023-05-29T10:05:49.084438000Z windows_logical_disk_write_seconds_total{volume="HarddiskVolume1"} = 1.3329828349090552e+17
2023-05-29T06:59:49.177702100Z windows_logical_disk_free_megabytes{volume="C:"} = 89258
2023-05-29T10:05:49.084438000Z windows_logical_disk_free_megabytes{volume="HarddiskVolume1"} = 130
2023-05-29T10:05:49.084438000Z windows_logical_disk_idle_seconds_total{volume="C:"} = 1.3329828349090552e+17
2023-05-29T10:05:49.084438000Z windows_logical_disk_idle_seconds_total{volume="HarddiskVolume1"} = 1.3329828349090552e+17
[...]

When pushing these metrics to prometheus, it starts rejected them with out of bounds error after some time.

To Reproduce
Use the following configuration:

[SERVICE]
    flush        1
    daemon       Off
    log_level    trace
    log_file C:\fluent-bit\log.txt
    parsers_file parsers.conf
    plugins_file plugins.conf
    http_server  Off
    http_listen  0.0.0.0
    http_port    2020
    storage.metrics on

[INPUT]
    name            windows_exporter_metrics
    tag             node_metrics
    scrape_interval 15

[OUTPUT]
    Name file
    Match node_metrics
    File C:\fluent-bit\metrics.txt

Start fluent-bit and wait a couple of minutes and check the metrics.txt file.

PS C:\fluent-bit> .\bin\fluent-bit.exe -c .\conf\fluent-bit.conf

Expected behavior
All metrics have a current timestamp.

Your Environment

• Version used: fluent-bit-2.1.4-win64.exe (same for 2.1.0)
• Configuration: See above
• Server type and version: Virtualbox 6.1 on Ubuntu 22.04.2 LTS
• Operating System and version: Windows Server 2019, latest patches applied
• Filters and plugins: windows_exporter_metrics,

[HerrBlauwasser]

I could reproduce the issue on the following configurations using fluent-bit 2.1.4 (64bit):

• Windows 10 Pro running on Virtualbox 6.1 on Ubuntu 22.04.2 LTS
• Windows 11 (22H2, latest patches applied) running on ThinkPad E14