PulpStatus - fix storage gauge when the backend reports no capacity

[warisshaikh1]

Problem

On any install that keeps artifacts in object storage, the Status page reports storage as a red, 100%-full gauge with Total: 0 bytes and Free: 0 bytes — regardless of how little is actually stored.

Reproduced on pulpcore 3.116.0 with a Ceph RGW (S3) backend. /pulp/api/v3/status/ returns:

{
  "storage": {
    "total": null,
    "used": 188976272,
    "free": null
  }
}

Cause

null here is the documented API contract, not an error. _disk_usage() in pulpcore/app/views/status.py only measures real capacity for filesystem storage:

def _disk_usage():
    domain = get_domain()
    if domain.storage_class == "pulpcore.app.models.storage.FileSystem":
        storage = domain.get_storage()
        try:
            return shutil.disk_usage(storage.location)
        except Exception:
            _logger.exception(_("Failed to determine disk usage"))
    else:
        used = Artifact.objects.filter(pulp_domain=domain).aggregate(size=Sum("size", default=0))
        return StorageSpace(None, used["size"], None)

An object store has no capacity to measure, so total and free are None — and StorageSerializer declares both allow_null=True.

StatusStorage doesn't handle that:

• (100 / null) * used → null coerces to 0 → Infinity. Progress clamps that to a full bar, and the variant ladder reads Infinity > 88 as danger, hence red and full.
• getHumanSize(null) → parseInt(null, 10) || 0 → 0 → "0 bytes" for both Total and Free.

There's a second, related problem on the filesystem path: if shutil.disk_usage() raises, _disk_usage() falls through and returns None, so storage itself is null. storage.total then throws a TypeError that blanks the entire Status page.

Fix

Draw the gauge only when there is a capacity to draw a percentage against, and report unmeasured fields as Not reported rather than as zero. The filesystem case is untouched.

status.storage	before	after
{total: null, used: 188976272, free: null}	Infinity, variant=danger, Total: 0 bytes, Free: 0 bytes	gauge hidden, Total: Not reported, Used: 180 MiB, Free: Not reported
{total: 107374182400, used: 53687091200, free: 53687091200}	50%	50% (unchanged)
null	TypeError — blank page	gauge hidden, all three Not reported

I deliberately left getHumanSize() alone: it's shared with the execution-environment views, which pass real numbers, so distinguishing "unmeasured" from "zero" belongs at this call site rather than in the shared helper.

No CHANGES.md entry, since that file is generated from PR titles by the release workflow.

Testing

• npm run lint:js, npm run lint:ts, npm run lint:ls — clean
• npm run build — succeeds (only the pre-existing bundle-size warnings)
• Verified against a live pulpcore 3.116.0 on Ceph RGW, and against the filesystem and null payload shapes above

Happy to adjust the Not reported wording, or to show a plain "Used: X" line without the labels for the unmeasured case, if maintainers prefer.

[warisshaikh1]

@bmbouter @himdel @dkliban @ipanova