Add IO stats and ext4 FS stats through new ext4 collector #3295
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Opened in place of: #3047
Fixes: #3005
Adds:
From
/sys/fs/ext4/<partition>/errors_count: number of ext4 errors (commit)/sys/fs/ext4/<partition>/warning_count: number of ext4 warning log messages (commit)/sys/fs/ext4/<partition>/msg_count: number of other ext4 log messagesand
From
/sys/block/<disk>/device/ioerr_cnt: number of SCSI commands that completed with an error/sys/block/<disk>/device/iodone_cnt: number of completed or rejected SCSI commandsImplements new
ext4collector.Corresponding procfs changes: prometheus/procfs#651