[2.3.0] Checkmk Werk 16373 created: metrics: allow dots in metric ids

[//]: # (werk v2) # metrics: allow dots in metric ids key | value ---------- | --- date | 2024-02-28T08:35:14+00:00 version | 2.3.0b1 class | fix edition | cre component | rest-api level | 1 compatible | yes Before this Werk, the REST API was not able to access metrics named after IP addresses. This Werk fixes that and allows user to access metrics containing dots on the id