When executing asynchronous sections or plugins the Check_MK Agent uses
run_cached() for putting them in the background. This function
creates a cachefile with the extension .new and removes that suffix
when the actual plugin has finished. If due to a server crash the file keeps
lying around the the plugin would not be executed anymore.
We now remove that file if it is older then twice the cache age and
we kill any process that still has open that file. That way we avoid
overlapping plugins in case of a real hanger.
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