** Description changed:

- In the systemd service we make use of the `ovn-ctl` script
- `run_nb_ovsdb` and `run_sb_ovsdb` sub-commands introduced in [0]. These
- sub-commands fit nicely with systemd's expectations of modern daemons to
- no longer detachand run in the background.
+ [Impact]
+ 
+ [Test Case]
+ 
+ [Regression Potential]
+ 
+ 
+ [Original Bug Report]
+ In the systemd service we make use of the `ovn-ctl` script `run_nb_ovsdb` and 
`run_sb_ovsdb` sub-commands introduced in [0]. These sub-commands fit nicely 
with systemd's expectations of modern daemons to no longer detachand run in the 
background.
  
  However, the change in [0] has the side effect of disabling automatic
  upgrading of clustered databases. Previously this would have been done
  on every startup [1].
  
  A recent commit to master [2] addresses this and uses the combination of
  presence of `--db-*-cluster-local-addr` and non-presence of the `--db
  -*-cluster-remote-addr` to determine if the upgrade should be run.
  
  We should backport [2] to our supported OVN packages to prepare for
  supporting upgrades that require database schema changes. We may also
  need to change the behavior of the ovn-central charm to not set the
  `--db-*-cluster-remote-addr` argument on the leader unit.
  
  0: 
https://github.com/ovn-org/ovn/commit/6444059b5f9444ce06634794d275257f945a6ce5
  1: 
https://github.com/ovn-org/ovn/blob/5c2d311b8b7b4d5c3a619de72be6a433aa4c44db/utilities/ovn-ctl#L312-L314
  2: 
https://github.com/ovn-org/ovn/commit/67e2f386cc838d0b0f9b4b5da7fe611e1113b70c

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https://bugs.launchpad.net/bugs/1907081

Title:
  Clustered OVN database is not upgraded on package upgrade

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