Fs usage should filter to all known fs

[johnsonw]

When fetching data on FS usage, we should filter to only the known filesystems

Signed-off-by: johnsonw wjohnson@whamcloud.com

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This change is 

[johnsonw]

The query being sent to influx:

SELECT SUM(bytes_total) as bytes_total, SUM(bytes_free) as bytes_free, SUM("bytes_avail") as bytes_avail FROM (    SELECT LAST("bytes_total") AS bytes_total,    LAST("bytes_free") as bytes_free,    LAST("bytes_avail") as bytes_avail    FROM "target" WHERE "kind" = 'OST' AND "fs" =~ /fs2|fs/ GROUP BY target    )

Notice the where clause requires that a filesystem be specified for the OST.

Filesystem data:

[root@mds1 ~]# lfs df -h
UUID                       bytes        Used   Available Use% Mounted on
fs-MDT0000_UUID             2.8G        2.1M      288.8M   1% /mnt/fs[MDT:0]
fs-MDT0001_UUID             2.8G        2.0M      288.9M   1% /mnt/fs[MDT:1]
fs-OST0000_UUID             4.6G       21.5M        3.9G   1% /mnt/fs[OST:0]
fs-OST0001_UUID             4.6G       21.5M        3.9G   1% /mnt/fs[OST:1]
fs-OST0002_UUID             4.6G       21.5M        3.9G   1% /mnt/fs[OST:2]
fs-OST0003_UUID             4.6G       21.5M        3.9G   1% /mnt/fs[OST:3]
fs-OST0004_UUID             4.6G       21.5M        3.9G   1% /mnt/fs[OST:4]
fs-OST0005_UUID             4.6G       21.5M        3.9G   1% /mnt/fs[OST:5]
fs-OST0006_UUID             4.6G       21.5M        3.9G   1% /mnt/fs[OST:6]
fs-OST0007_UUID             4.6G       21.5M        3.9G   1% /mnt/fs[OST:7]
fs-OST0008_UUID             4.6G       21.5M        3.9G   1% /mnt/fs[OST:8]
fs-OST0009_UUID             4.6G       21.5M        3.9G   1% /mnt/fs[OST:9]

filesystem_summary:        45.8G      214.6M       38.8G   1% /mnt/fs

UUID                       bytes        Used   Available Use% Mounted on
fs2-MDT0000_UUID            2.8G        1.9M        2.5G   1% /mnt/fs2[MDT:0]
fs2-OST0000_UUID            4.6G        1.2M        4.3G   1% /mnt/fs2[OST:0]
fs2-OST0001_UUID            4.6G        1.2M        4.3G   1% /mnt/fs2[OST:1]
fs2-OST0002_UUID            4.6G        1.2M        4.3G   1% /mnt/fs2[OST:2]
fs2-OST0003_UUID            4.6G        1.2M        4.3G   1% /mnt/fs2[OST:3]
fs2-OST0004_UUID            4.6G        1.2M        4.3G   1% /mnt/fs2[OST:4]
fs2-OST0005_UUID            4.6G        1.2M        4.3G   1% /mnt/fs2[OST:5]
fs2-OST0006_UUID            4.6G        1.2M        4.3G   1% /mnt/fs2[OST:6]
fs2-OST0007_UUID            4.6G        1.2M        4.3G   1% /mnt/fs2[OST:7]
fs2-OST0008_UUID            4.6G        1.2M        4.3G   1% /mnt/fs2[OST:8]
fs2-OST0009_UUID            4.6G        1.2M        4.3G   1% /mnt/fs2[OST:9]

filesystem_summary:        45.8G       12.3M       43.1G   1% /mnt/fs2

214.6MB + 12.3MB = 226.9MB, which matches what's in the chart.

I also have two snapshots mounted:

[root@mds1 ~]# mount -t lustre
/dev/mapper/mpatha on /mnt/mgs type lustre (ro,svname=MGS,nosvc,mgs,osd=osd-ldiskfs,user_xattr,errors=remount-ro,data=ordered)
/dev/mapper/mpathb on /mnt/mdt0 type lustre (ro,svname=fs-MDT0000,mgsnode=10.73.20.11@tcp:10.73.20.12@tcp,osd=osd-ldiskfs,user_xattr,errors=remount-ro,data=ordered)
10.73.20.11@tcp:10.73.20.12@tcp:/fs on /mnt/fs type lustre (rw,flock,lazystatfs)
10.73.20.11@tcp:10.73.20.12@tcp:/fs2 on /mnt/fs2 type lustre (rw,flock,lazystatfs)
/dev/loop0 on /mnt/test2_MDT0000 type lustre (ro,svname=11c6255d-MDT0000,nomgs,rdonly_dev,mgsnode=10.73.20.11@tcp:10.73.20.12@tcp,osd=osd-ldiskfs,user_xattr,errors=remount-ro,data=ordered,noload)
/dev/loop2 on /mnt/test1_MDT0000 type lustre (ro,svname=07310bad-MDT0000,nomgs,rdonly_dev,mgsnode=10.73.20.11@tcp:10.73.20.12@tcp,osd=osd-ldiskfs,user_xattr,errors=remount-ro,data=ordered,noload)

[root@adm ~]# iml snapshot list fs
+------------+----------+---------------------------------+---------+---------+
| Filesystem | Snapshot | Creation Time                   | State   | Comment |
+============+==========+=================================+=========+=========+
| fs         | test1    | Tue, 08 Dec 2020 10:14:49 +0000 | mounted | ---     |
+------------+----------+---------------------------------+---------+---------+
| fs         | test2    | Tue, 08 Dec 2020 10:42:15 +0000 | mounted |         |
+------------+----------+---------------------------------+---------+---------+

[johnsonw]

CI Passed here: https://build.whamcloud.com/job/manager-for-lustre/3248/

[jgrund]

This PR needs to be moved.