Tacker server can not monitor VNF instance after restarted Tacker server

[changzhi]

===== How to Reproduce =====
1. Create a VNFD with monitor params, such as:

...
        monitoring_policy:
          name: ping
          parameters:
            count: 3
            interval: 10
          actions:
            failure: respawn
...

2. Create a VNF by using the VNFD above.

3. Restart Tacker server.

4. Login the VNF and execute "ifconfig eth0 down"

Finally, the VNF doesn't respawn.

The VNF is active as below:
stack@devstack:~/tacker$ tacker vnf-list
+--------------------------------------+---------+-----------------------+----------------------------+--------+--------------------------------------+------------------------+--------------+
| id | name | description | mgmt_url | status | vim_id | placement_attr | error_reason |
+--------------------------------------+---------+-----------------------+----------------------------+--------+--------------------------------------+------------------------+--------------+
| 274f4c36-c482-488e-b749-aca8c20c7205 | openwrt | OpenWRT with services | {"VDU1": "192.168.120.11"} | ACTIVE | d4eaaaeb-ad2b-4896-8d10-c930bbf25876 | {u'vim_name': u'VIM0'} | |
+--------------------------------------+---------+-----------------------+----------------------------+--------+--------------------------------------+------------------------+--------------+

[Ashish (ashish235)]

Affected by this bug.

[Ashish (ashish235)]

Team, can we get a timeline please when we can expect this to be fixed. This bug is huge blocker for using Tacker in production.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/614964

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/rocky
Review: https://review.openstack.org/625461

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/614964
Committed: https://git.openstack.org/cgit/openstack/tacker/commit/?id=5ae9dd03c7ce43ed8a54b1d4f428231988b471fd
Submitter: Zuul
Branch: master

commit 5ae9dd03c7ce43ed8a54b1d4f428231988b471fd
Author: bhagyashris <email address hidden>
Date: Thu Nov 8 10:35:49 2018 +0900

    Add VNF to monitor after restarting tacker service

    If you restart tacker service, it doesn't monitor previously
    created VNFs.

    This patch will read all VNFs from db and add to monitor
    during initialization of VFNM plugin.

    Change-Id: I1d49f9442dbc34794e01fbefb4ef82af21171956
    Closes-Bug: #1616712

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/625461
Committed: https://git.openstack.org/cgit/openstack/tacker/commit/?id=1abe8701e9de1f62c46b316b9c63ceb275361ecc
Submitter: Zuul
Branch: stable/rocky

commit 1abe8701e9de1f62c46b316b9c63ceb275361ecc
Author: bhagyashris <email address hidden>
Date: Thu Nov 8 10:35:49 2018 +0900

    Add VNF to monitor after restarting tacker service

    If you restart tacker service, it doesn't monitor previously
    created VNFs.

    This patch will read all VNFs from db and add to monitor
    during initialization of VFNM plugin.

    Change-Id: I1d49f9442dbc34794e01fbefb4ef82af21171956
    Closes-Bug: #1616712

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/queens
Review: https://review.openstack.org/630914

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/pike
Review: https://review.openstack.org/631108

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/tacker 1.0.0.0rc1 release candidate.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/631108
Committed: https://git.openstack.org/cgit/openstack/tacker/commit/?id=4d1e0ec14b864395ef5df7da79785713f18efc80
Submitter: Zuul
Branch: stable/pike

commit 4d1e0ec14b864395ef5df7da79785713f18efc80
Author: bhagyashris <email address hidden>
Date: Tue Jan 15 18:44:37 2019 +0900

    Add VNF to monitor after restarting tacker service

    If you restart tacker service, it doesn't monitor previously
    created VNFs.

    This patch will read all VNFs from db and add to monitor
    during initialization of VFNM plugin.

    Change-Id: I1d49f9442dbc34794e01fbefb4ef82af21171956
    Closes-Bug: #1616712
    (cherry picked from commit 5ae9dd03c7ce43ed8a54b1d4f428231988b471fd)

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/tacker 0.8.2 release.

[OpenStack Infra (hudson-openstack)]

Change abandoned by Hiroyuki Jo (<email address hidden>) on branch: stable/queens
Review: https://review.opendev.org/630914
Reason: Queens is already unmaintained. We should abandon this patch.

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/tacker rocky-eol release.