Metricbeat 7.17.7+ stopped reporting filesystem usage

[henrikno]

We upgraded from metricbeat 7.17.5 to 7.17.9 and filesystem usage stopped getting reported. It was logging an error: error getting filesystem usage for /hostfs/run/docker/netns/default: error in Statfs syscall: permission denied

This commit made any filesystem not reporting usage an error and aborts reporting all the filesystem usage. https://github.com/elastic/beats/commit/296b380da0df0c41cc1497646a64b2d20bf79f64#diff-1d4a29b732705abccd5f7e4f009db29164437bf1e41e9947e559d3ed6d759329R92

This has been fixed in 8.5+ https://github.com/elastic/beats/pull/33646, but bug still exists on 7.17. Since this refactor was backported to 7.17, can we backport the bugfix as well?

I think I found a workaround by setting filesystem.ignore_types to filesystem.ignore_types: [nsfs, sysfs, tmpfs, bdev, proc, cgroup, cgroup2, cpuset, devtmpfs, configfs, debugfs, tracefs, securityfs, sockfs, bpf, pipefs, ramfs, hugetlbfs, devpts, ecryptfs, fuse, fusectl, mqueue, pstore, autofs, overlay, aufs] (nsfs was the problematic one)

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[botelastic[bot]]

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