[BUG] Whispers under symlinks are not returned for queries (Grafana) with wildcards

[interfan7]

Describe the bug
For metrics in Whisper files which are under symlink (in the path):

• Quering the metric specifically, e.g. x.y.z.w, is returned as expected.
• Quering multiple metrics based on text-search, i.e. aliasByNode(x.[j]*y*.z.*.w, 1, 4), return only the metrics whose backing Whisper files are not under symlink.

It seems some searching functionality may malfunction when there is a symlink in the path of the Whispers.

CarbonAPI Version
0.16.0~1

Logs
Will update if I reproduce and find something which might be interesting.

CarbonAPI Configuration:
Basically we've barely modified the file versus the default version. We've focused on listening host:port. Will provide if necessary.

Simplified query (if applicable)
A general query template is in the description.

Backend metric retention and aggregation schemas
Will provide if needed, I believe it is not related to the nature of this issue.

Backend response (if possible)
Not sure what to fill-in here other than what is elaborated in description.
Our backend is go-carbon, the default behavior. We've not employed other solutions such as clickhouse.

Additional context
go-carbon 0.17.1.

[Civil]

On carbonapi level, there is no distinction between symlink or not anymore. I'd suspect that go-carbon returns weird results

[interfan7]

On carbonapi level, there is no distinction between symlink or not anymore. I'd suspect that go-carbon returns weird results

Do you suggest me to create a new issue in go-carbon project?

(I'm not aware of GH having ability to port issue report to another project? Especially as each project has its own desired reporting format.)

[deniszh]

Do you suggest me to create a new issue in go-carbon project?

I would say that make sense, especially because proper investigation would require some additional information, like, go-carbon config and exact symlink paths.