|Component||Core & Setup|
|Title||Improved error handling in case of upgrades/downgrades|
|Check_MK Edition||Check_MK Enterprise Edition (CEE)|
|Level||2 - Prominent Change|
|Compatibility||Compatible - no manual interaction needed|
CMC stores its current state in versioned state files, which are only
downwards-compatible. When an incompatible state file is found, we
immediately terminate the monitoring core during startup.
- When the state file version is older than the current one (e.g. after
an upgrade), convert it on the fly (as previously), but keep a backup of the
previous version in "state-version-XY".
- When the state file version is newer than the current one (e.g. after a
downgrade), emit an error message, hinting at the backup version if there is
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