[2.4.0] Checkmk Werk 17113 created: Integrate popular "Ceph statistics" plugin

[//]: # (werk v2) # Integrate popular "Ceph statistics" plugin key | value ---------- | --- date | 2024-07-08T11:22:28+00:00 version | 2.4.0b1 class | feature edition | cre component | checks level | 1 compatible | yes This werk integrates the popular Ceph plugin written by Robert Sander into Checkmk. This adds the plugins * Ceph Storage: Status * Ceph Storage: Pools * Ceph Storage: Classes * Ceph Storage: OSD - BlueFS Slow Device * Ceph Storage: OSD - BlueFS Database Device * Ceph Storage: OSD - BlueFS Write-Ahead Log Enterprise users can deploy the agent plugin using the bakery ruleset _"Ceph (Linux)"_. It requires python and the third party python library 'rados' to be installed. Users who previously used Robert Sanders MKP [Ceph statistics](https://exchange.checkmk.com/p/ceph) should upgrade it to the most recent version, which shall disable itself upon upgrade to Checkmk 2.4. (This werk will be updated once the version is confirmed.) The only change will be the renamed host labels, that all get the _"cmk/"_ prefix (_"ceph/osd"_ becomes "_cmk/ceph/osd"_ and _"ceph/mon"_ becomes _"cmk/ceph/mon"_). Since it provides a more comprehensive monitoring of Ceph devices, it will replace the previous Ceph plugins * Ceph Storage: Health Status * Ceph Storage: OSDs * Ceph Storage: PGs * Ceph Storage: MGRs * Ceph Storage: Pools These plugins will continue to work in Checkmk 2.4 as long as an agent is deployed using the old agent plugin. New deployments however will contain the new plugin.