Added host labels for the checkmk agents version - #951
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General information
With this two new host labels are being introduced, to help with host filtering and matching:
Proposed changes
Until now, an agents version could only be found out with either the "Check_MK Agent" Service or the HW-/SW-Inventory. Both could be used for filtering in views, but especially if you want to match rules only on hosts that have a specific version this was simply not possible.
But with this PR, every host that has an installed Checkmk agent will discover those two host labels. One for the major version like "2.4.0" or "2.5.0" and one with the exact version like "2.5.0p11". One for broad filtering and one for exact filtering. This enables users to more easily filter in dashboards and views for specific agent versions and administrators to match rules only for specific agent versions, e.g. if you want to disable the "System Time" Service for all hosts, that already have a 2.5.0 Checkmk Agent, as with this there come the new "Windows time service" services.