type of data source is incorrect

[sihara]

# lctl get_param llite.*.stats
llite.ai400x-ffff96c77325c000.stats=
snapshot_time             1602841753.046578144 secs.nsecs
read_bytes                10556773 samples [bytes] 1 16777216 41809545646900
write_bytes               29461907 samples [bytes] 1 8388608 12108075547325
read                      9322645 samples [usec] 0 2452935 439997359929
write                     29461908 samples [usec] 0 13424175 246414418996
ioctl                     13327 samples [reqs]
open                      841501 samples [usec] 0 269934 370300646
close                     841461 samples [usec] 0 133320 518838693
mmap                      158922 samples [usec] 1 441 551480
page_fault                68572074 samples [usec] 0 111924 35539384
page_mkwrite              8456 samples [usec] 2 56400 8116217
seek                      692298 samples [usec] 0 906 235054
readdir                   56712 samples [usec] 0 7426 7049590
setattr                   4034 samples [usec] 68 23557 1174819
truncate                  2847 samples [usec] 157 5706 1327775
flock                     1008 samples [usec] 52 344 85065
getattr                   3119348 samples [usec] 0 114133 169403137
unlink                    230879 samples [usec] 104 133784 194829841
mkdir                     18840 samples [usec] 105 65748 11818963
rmdir                     18232 samples [usec] 97 13584 2944967
rename                    22124 samples [usec] 100 101265 21533752
statfs                    1906 samples [usec] 0 388 65867
getxattr                  252700 samples [usec] 0 226532 332799370
getxattr_hits             4597 samples [reqs]
inode_permission          11771031 samples [usec] 0 1495 187190

In Lustre client stats, client_stats_write_bytes_samples, client_stats_read_bytes_samples, client_stats_write_bytes_sum and client_stats_read_bytes_sum shoudl be derive, not gauge.

[sihara]

Actually, all client's "samples" metrices should be derive rather than gauge as well as samples metrices in OST and MDT, shouldn't it?