[receiver/filestats] Size of folder should reflect actual used bytes of the folder containing files similar to du

[robsliwi]

Component(s)

receiver/filestats

Is your feature request related to a problem? Please describe.

Given most of the Linux systems out there, when specifying a folder for the filestats receiver it will output 4096 as value (smallest allocation unit of the filesystem for a folder).
No matter how large the actual directory is. We'd like to monitor some certain directories for growth and this would be a great addition.

A config:

receivers:
  filestats:
    collection_interval: 10s
    include: "/tmp"
exporters:
  debug:
    verbosity: detailed
service:
  pipelines:
    metrics:
      receivers: [ filestats ]
      exporters: [ debug ]

will return

----->&-----
Metric #1
Descriptor:
     -> Name: file.size
     -> Description: The size of the file or folder, in bytes.
     -> Unit: b
     -> DataType: Gauge
NumberDataPoints #0
StartTimestamp: 2024-05-13 13:02:35.753366344 +0000 UTC
Timestamp: 2024-05-13 13:02:36.756113856 +0000 UTC
Value: 4096
----->&-----

in comparison to du

$ du -sh /tmp
5,1 G

Describe the solution you'd like

An option to output folder stats as du does it.

Describe alternatives you've considered

No response

Additional context

No response

[github-actions]

Pinging code owners:

• receiver/filestats: @atoulme

See Adding Labels via Comments if you do not have permissions to add labels yourself.

[github-actions]

This issue has been inactive for 60 days. It will be closed in 60 days if there is no activity. To ping code owners by adding a component label, see Adding Labels via Comments, or if you are unsure of which component this issue relates to, please ping @open-telemetry/collector-contrib-triagers. If this issue is still relevant, please ping the code owners or leave a comment explaining why it is still relevant. Otherwise, please close it.

Pinging code owners:

• receiver/filestats: @atoulme

See Adding Labels via Comments if you do not have permissions to add labels yourself.

[github-actions]

This issue has been closed as inactive because it has been stale for 120 days with no activity.