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* First pass to get the script working right
* Finish adding analytics tags
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* Bulk add frontmatter
* A few extra edge cases
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* [collector/slabinfo] Fix pagesize not defined in non-x86 arches
Fixes #6896 : Fail to build on raspberry pi
Some arches does not export PAGE_SIZE in sys/user.h
Changed constant to static var fetched from POSIX sysconf(_SC_PAGESIZE)
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### Summary
Provide new collector parsing `/proc/slabinfo` to provide details on kernel slab structures.
Asked by issue #13 (very happy for the oldest issue in backlog)
##### Component Name
collectors/slabinfo.plugin
##### Additional Information
This slabinfo details allows to have clues on actions done on your system.
In the following screenshot, you can clearly see a `find` done on a ext4 filesystem (the number of `ext4_inode_cache` & `dentry` are rising fast), and a few seconds later, an admin issued a `echo 3 > /proc/sys/vm/drop_cached` as their count dropped.
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