Werk #10601: Auto migration of check plugins to new section definitions

We are now converting all plugins to the format expected by the new API for check and inventory plugins.

This 'auto-migration' is done in memory upon loading the plugins, all files will remain unchanged on disk.

Migrated are plugins from

• share/check_mk/checks
• local/share/check_mk/checks
• share/check_mk/inventory
• local/share/check_mk/inventory

Although we are trying to migrate as many check and inventory plugins as possible on the fly, for some plugins this may fail. You can check for failing auto-migrations running the command cmk -R. You will be informed of any auto-migration failures.

If that is the case, you have to migrate your plugin manually.

These are the anticipated reasons why auto-migration may fail:

A cluster aware checkplugin

Checkmk refuses to auto-migrate cluster aware check plugins (those with node_info set to True). Auto converting the data layout is too error prone.

Checkplugins using 'extra_sections'

Checkmk refuses to auto-migrate check plugins that make use of the 'extra_sections' feature. In the new API the destiction between the regular section and additional 'extra_sections' is not made, and all section content will be passed in its 'parsed' version. Please refer to the Sphinx documentation of register.check_plugin for details on the usage of the sections keyword.

A missing SNMP scan function

Every Checkplugin that specifies an 'snmp_info' key must specify 'snmp_scan_function' as well.

A complex SNMP scan function

If Checkmk fails to auto-migrate a legacy SNMP plugin to a section definition, this is most likely due to an elaborate scan function. For the auto-migration to work, the scan function must be fairly simple. Make sure your scan function has the following properties:

• it only consists of one single return statement
• it does not in turn call other functions (not even 'all' or 'any')
• it does not negate compound expressions

If in doubt, take a look at scan functions that succeed to be migrated to see what options are available.

Known limitations

• HostLabels are only supported via the new API (see werk #11117)

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