/etc/icinga2/features-available/perfdata.conf is in icinga2-common 2.6.0-2+deb9u1.
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 8 | /**
* The PerfdataWriter type writes performance data files and rotates
* them in a regular interval.
*/
library "perfdata"
object PerfdataWriter "perfdata" { }
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