Dynamic prefix with S3

[VishalPhenom]

Whenever i am using S3 bucket it is storing logs to rood directory only. i am pushing json object with some parameter to loki, want to set prefix path as per variable in json.

ex.

default path is : /tmp/loki

my json obj:

{
    "streams":
        [
            {
                "stream":
                {
                    "refNum":"something"
                },
                "values":
                [
                    ["1643323824886697738","Test"]
                ]
            }
        ]
}

now as per the above json object prefix should be /something/loki, this "something" is refNum in json obj.

[dannykopping]

Duplicate of #5889