Harvest should collect LUNs in Qtrees

[cgrinds]

Thanks to ben on Discord for raising.

There can be multiple luns in the same qtree.

[Hardikl]

Tested in main with commit febb62c

validated this lun naming convention

<root>
<attributes-list>
<lun-info><node>umeng-aff300-02</node><online>true</online><path>/vol/osc_iscsi_vol01/lun:d32abf06-0327-4d06-bb9d-1c19c8eeea01</path><qtree></qtree><size>2147483648</size><size-used>68349952</size-used><state>online</state><uuid>98ba5831-06a3-44cb-ac9b-b9cc631cf850</uuid><volume>osc_iscsi_vol01</volume><vserver>ostack-iscsi-dnd</vserver></lun-info>
<lun-info><node>umeng-aff300-01</node><online>true</online><path>/vol/osc_iscsi_vol01/qtree1/lun:1c19c8ee-0327-4d06-bb9d-d32abf069081</path><qtree>qtree1</qtree><size>1073741824</size><size-used>0</size-used><state>online</state><uuid>be36e895-f62f-48e8-940f-c8deb98c877f</uuid><volume>osc_iscsi_vol01</volume><vserver>ostack-iscsi-dnd</vserver></lun-info>
</attributes-list>
</root>

Harvest can able to parse those 2 lun path formats

harvest % curl -s http://localhost:14001/metrics | grep -Ev "#|metadata_"
lun_labels{cluster="umeng-aff300-01-02",datacenter="rest",lun="lun:d32abf06-0327-4d06-bb9d-1c19c8eeea01",node="umeng-aff300-02",qtree="",state="online",svm="ostack-iscsi-dnd",volume="osc_iscsi_vol01"} 1.0
lun_new_status{cluster="umeng-aff300-01-02",datacenter="rest",lun="lun:d32abf06-0327-4d06-bb9d-1c19c8eeea01",node="umeng-aff300-02",qtree="",svm="ostack-iscsi-dnd",volume="osc_iscsi_vol01"} 1
lun_size{cluster="umeng-aff300-01-02",datacenter="rest",lun="lun:d32abf06-0327-4d06-bb9d-1c19c8eeea01",node="umeng-aff300-02",qtree="",svm="ostack-iscsi-dnd",volume="osc_iscsi_vol01"} 2147483648
lun_size_used{cluster="umeng-aff300-01-02",datacenter="rest",lun="lun:d32abf06-0327-4d06-bb9d-1c19c8eeea01",node="umeng-aff300-02",qtree="",svm="ostack-iscsi-dnd",volume="osc_iscsi_vol01"} 68349952
lun_size_used_percent{cluster="umeng-aff300-01-02",datacenter="rest",lun="lun:d32abf06-0327-4d06-bb9d-1c19c8eeea01",node="umeng-aff300-02",qtree="",svm="ostack-iscsi-dnd",volume="osc_iscsi_vol01"} 3.1827926635742188
lun_labels{cluster="umeng-aff300-01-02",datacenter="rest",lun="lun:1c19c8ee-0327-4d06-bb9d-d32abf069081",node="umeng-aff300-01",qtree="qtree1",state="online",svm="ostack-iscsi-dnd",volume="osc_iscsi_vol01"} 1.0
lun_size{cluster="umeng-aff300-01-02",datacenter="rest",lun="lun:1c19c8ee-0327-4d06-bb9d-d32abf069081",node="umeng-aff300-01",qtree="qtree1",svm="ostack-iscsi-dnd",volume="osc_iscsi_vol01"} 1073741824
lun_size_used{cluster="umeng-aff300-01-02",datacenter="rest",lun="lun:1c19c8ee-0327-4d06-bb9d-d32abf069081",node="umeng-aff300-01",qtree="qtree1",svm="ostack-iscsi-dnd",volume="osc_iscsi_vol01"} 0
lun_size_used_percent{cluster="umeng-aff300-01-02",datacenter="rest",lun="lun:1c19c8ee-0327-4d06-bb9d-d32abf069081",node="umeng-aff300-01",qtree="qtree1",svm="ostack-iscsi-dnd",volume="osc_iscsi_vol01"} 0
lun_new_status{cluster="umeng-aff300-01-02",datacenter="rest",lun="lun:1c19c8ee-0327-4d06-bb9d-d32abf069081",node="umeng-aff300-01",qtree="qtree1",svm="ostack-iscsi-dnd",volume="osc_iscsi_vol01"} 1

harvest % curl -s http://localhost:14001/metrics | grep -Ev "#|metadata_" | grep lun_label
lun_labels{cluster="umeng-aff300-01-02",datacenter="rest",lun="lun:d32abf06-0327-4d06-bb9d-1c19c8eeea01",node="umeng-aff300-02",qtree="",state="online",svm="ostack-iscsi-dnd",volume="osc_iscsi_vol01"} 1.0
lun_labels{cluster="umeng-aff300-01-02",datacenter="rest",lun="lun:1c19c8ee-0327-4d06-bb9d-d32abf069081",node="umeng-aff300-01",qtree="qtree1",state="online",svm="ostack-iscsi-dnd",volume="osc_iscsi_vol01"} 1.0

harvest %