/etc/icinga2/features-available/checker.conf is in icinga2-common 2.1.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | /**
* The checker component takes care of executing service checks.
*/
library "checker"
object CheckerComponent "checker" { }
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