[2.4.0] Checkmk Werk 16984 created: Unify and improve file system perfometers

[//]: # (werk v2) # Unify and improve file system perfometers key | value ---------- | --- date | 2024-05-27T15:34:15+00:00 version | 2.4.0b1 class | feature edition | cre component | multisite level | 1 compatible | yes In most cases, the perfometer of file system services shows the used space in percent. However, before this werk, in rare cases, this perfometer displayed multiple segments. In particular, this was the case for file systems with provisioning or overcommittment. In such cases, the interpretation of the perfometer was unclear. Therefore, as of this werk, the perfometer always displays the used space in percent. Furthermore, the displayed value now takes reserved space into account. Before, reserved space was ignored when computing the usage displayed by the perfometer.