Werk #14297: Remove pre-1.6 dashboard plugin compatibility

Component	User interface
Title	Remove pre-1.6 dashboard plugin compatibility
Date	Sep 30, 2022
Level	Trivial Change
Class	Bug Fix
Compatibility	Incompatible - Manual interaction might be required
Checkmk versions & editions	2.2.0b1 Not yet released Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.2.0b1 Not yet released Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.2.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

In Checkmk 1.6 and previous versions custom dashboard element plugins could be registered by deploying a file to local/share/check_mk/web/plugins/dashboard/ with the following code to register with Checkmk:

dashlet_types["id_of_element"] = {
    "title"       : _("Title"),
    "sort_index"  : 45,
    "description" : "..."
    "render"      : dashlet_hoststats,
    "refresh"     : 60,
    "allowed"     : builtin_role_ids,
    "size"        : (30, 18),
    "resizable"   : False,
}

This mechanism was replaced with 1.6 and is now being removed. In case you still have dashboard plugins using this mechanism, you need to rework your plugin to be usable with Checkmk 2.2 or newer. Have a look at the dashboard plugins shipped with Checkmk to, to see how it needs to be structured (e.g. lib/check_mk/gui/plugins/dashboard/overview.py).

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