As of version 2.1.0p30 and 2.2.0p4, it was no longer possible to use the plugin postgres_instances,
if the instance name was empty. In previous versions, this plugin would show a service with
the item PostgreSQL Instance . This service would be OK, if there was at least one process
belonging to any postgres instance, and CRIT otherwise.
With this Werk, the plugin postgres_instances no longer crashes, if there is an empty instance name.
The old service PostgreSQL Instance is no longer discovered. Instead the new check plugin
postgres_processes can be used.
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