logger does not support private enterprise sub-tree.

[aellisv]

When specifying the RFC5424 SD-ID, I am prevented to use subtree specifications. For example:
if I use: --sd-id "myname@1234", logger works.
If I use: --sd-id "nyname@1234.123, logger errors out with: logger: invalid structured data ID: 'myname@1234.123'

Adding the subtree is allowed in the RFC5424 spec, sec 7.2.2 as follows.
An enterprise might decide to
use sub-identifiers below its private enterprise number. If sub-
identifiers are used, they MUST be separated by periods and be
represented as decimal numbers. An example for that would be
"32473.1.2".

[karelzak]

Good catch, thanks! Fixed.