mgr/zabbix: drop "total_objects" field

[tchaikov]

This field was removed from df output a while back in
342f309

Signed-off-by: Kefu Chai kchai@redhat.com

• References tracker ticket
• Updates documentation if necessary
• Includes tests for new functionality or reproducer for bug

[tchaikov]

this change should fix the failure of http://pulpito.ceph.com/kchai-2019-01-21_09:40:59-rados-wip-kefu2-testing-2019-01-21-1515-distro-basic-mira/3489233/

2019-01-21T10:22:44.372 INFO:teuthology.orchestra.run.mira081.stderr:2019-01-21 10:22:44.365 7f9338ff9700  1 -- v2:172.21.7.124:42660/1154950056 <== mgr.12174 v2:172.21.7.124:6800/29533 1 ==
== command_reply(tid 0: -1 Test failed: Remote method threw exception: Traceback (most recent call last):
2019-01-21T10:22:44.372 INFO:teuthology.orchestra.run.mira081.stderr:  File "/usr/lib/ceph/mgr/zabbix/module.py", line 350, in self_test
2019-01-21T10:22:44.372 INFO:teuthology.orchestra.run.mira081.stderr:    data = self.get_data()
2019-01-21T10:22:44.372 INFO:teuthology.orchestra.run.mira081.stderr:  File "/usr/lib/ceph/mgr/zabbix/module.py", line 174, in get_data
2019-01-21T10:22:44.372 INFO:teuthology.orchestra.run.mira081.stderr:    data['total_objects'] = df['stats']['total_objects']
2019-01-21T10:22:44.372 INFO:teuthology.orchestra.run.mira081.stderr:KeyError: ('total_objects',)

at http://pulpito.ceph.com/kchai-2019-01-21_09:40:59-rados-wip-kefu2-testing-2019-01-21-1515-distro-basic-mira/3489233/.

see also #26046

[tchaikov]

http://pulpito.ceph.com/kchai-2019-01-21_14:13:55-rados-wip-kefu2-testing-2019-01-21-1842-distro-basic-mira/