[Bug 2091947] Re: [SRU] Watcher crashes on creation of multiple audits and gets stuck in PENDING

[Bryan Fraschetti]

Debdiff for yoga that applies the upstream patch and accompanying unit
tests (squashed into one diff called omnibus-fixes.patch)

** Patch added: "lp2091947_yoga.debdiff"
   https://bugs.launchpad.net/ubuntu/+source/watcher/+bug/2091947/+attachment/5845927/+files/lp2091947_yoga.debdiff

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https://bugs.launchpad.net/bugs/2091947

Title:
  [SRU] Watcher crashes on creation of multiple audits and gets stuck in
  PENDING

Status in Ubuntu Cloud Archive:
  Fix Released
Status in Ubuntu Cloud Archive antelope series:
  New
Status in Ubuntu Cloud Archive bobcat series:
  New
Status in Ubuntu Cloud Archive caracal series:
  New
Status in Ubuntu Cloud Archive dalmation series:
  Fix Released
Status in Ubuntu Cloud Archive epoxy series:
  Fix Released
Status in Ubuntu Cloud Archive yoga series:
  New
Status in Ubuntu Cloud Archive zed series:
  New
Status in watcher package in Ubuntu:
  Fix Released
Status in watcher source package in Focal:
  New
Status in watcher source package in Jammy:
  New
Status in watcher source package in Noble:
  New
Status in watcher source package in Oracular:
  Fix Released
Status in watcher source package in Plucky:
  Fix Released

Bug description:
  A customer is facing an issue where the watcher-decision-engine
  service crashes when creating an audit plan with the Audit type set to
  CONTINUOUS. Below are the steps to reproduce the issue:

  Environment Details:
  1. Deploy Openstack Yoga on Jammy with Watcher and Gnocchi as watcher's storage backend

  2. Create an audit
  openstack optimize audit create --name workload_stabilization_test_1 -s workload_stabilization -g workload_balancing --audit_type CONTINUOUS --interval 60 --auto-trigger

  3. Check the audit state
  openstack optimize audit list
  Observe it says "CONTINUOUS ONGOING"

  4. Create a second audit
  openstack optimize audit create --name workload_stabilization_test_2 -s workload_stabilization -g workload_balancing --audit_type CONTINUOUS --interval 60 --auto-trigger

  5. Check the audit state
  openstack optimize audit list
  Observe the second audit is stuck in "CONTINUOUS PENDING"

  6. Check watcher's status and observe that it crashed with the following traceback
  systemctl status watcher-decision-engine.service

  Nov 27 19:53:54 juju-2752e1-86-lxd-27 watcher-decision-engine[965896]:     self.run()
  Nov 27 19:53:54 juju-2752e1-86-lxd-27 watcher-decision-engine[965896]:   File "/usr/lib/python3.10/threading.py", line 953, in run
  Nov 27 19:53:54 juju-2752e1-86-lxd-27 watcher-decision-engine[965896]:     self._target(*self._args, **self._kwargs)
  Nov 27 19:53:54 juju-2752e1-86-lxd-27 watcher-decision-engine[965896]:   File "/usr/lib/python3/dist-packages/apscheduler/schedulers/blocking.py", line 32, in _main_loop
  Nov 27 19:53:54 juju-2752e1-86-lxd-27 watcher-decision-engine[965896]:     wait_seconds = self._process_jobs()
  Nov 27 19:53:54 juju-2752e1-86-lxd-27 watcher-decision-engine[965896]:   File "/usr/lib/python3/dist-packages/apscheduler/schedulers/base.py", line 1006, in _process_jobs
  Nov 27 19:53:54 juju-2752e1-86-lxd-27 watcher-decision-engine[965896]:     jobstore_next_run_time = jobstore.get_next_run_time()
  Nov 27 19:53:54 juju-2752e1-86-lxd-27 watcher-decision-engine[965896]:   File "/usr/lib/python3/dist-packages/apscheduler/jobstores/sqlalchemy.py", line 84, in get_next_run_time
  Nov 27 19:53:54 juju-2752e1-86-lxd-27 watcher-decision-engine[965896]:     return utc_timestamp_to_datetime(float(next_run_time))
  Nov 27 19:53:54 juju-2752e1-86-lxd-27 watcher-decision-engine[965896]: TypeError: float() argument must be a string or a real number, not 'NoneType'

  This was fixed upstream in 2024.2 at
  https://opendev.org/openstack/watcher/commit/d6f169197efc5b4f6c8a2e6bc38177b0641ca05c
  which properly addresses the type conversion and
  https://opendev.org/openstack/watcher/commit/fbb290b2238e9e72054892e9ae6108a8907f47d7
  which adjusts the unit tests to accommodate this fix.

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