This is the first release candidate for the 1.5.4 stable release of ara.

Changes since 1.5.3:

CLI
---

New commands were added to the 'ara' CLI:

- ara playbook metrics: provides stats aggregated by name, path, ansible version or controller
- ara host metrics: provides task result stats for hosts across playbooks
- ara task metrics: provides duration stats aggregated by task name, action/module or path

Refer to the documentation for examples and more information on these commands:
https://ara.readthedocs.io/en/latest/cli.html

Callback plugin
---------------

- Threading is now disabled by default to avoid running into sqlite locking contention
  For details, see: https://github.com/ansible-community/ara/issues/195
- The callback didn't provide a timezone for timestamps which could result in a wrong
  interpretation by the API server. Timestamps are now provided as UTC.

Controller hostname
-------------------

The hostname of the controller that ran the playbook is now recorded by ara.

Playbooks can be filtered by controller in the UI as well as the API:

    /api/v1/playbooks?controller=localhost

As well as with the CLI, for example:

    ara playbook list --controller=localhost
    ara playbook metrics --controller=localhost

Container images
----------------

- ARA API server container images are now published to quay.io/recordsansible/ara-api
  in addition to hub.docker.com/r/recordsansible/ara-api.
- Fedora 32 images were replaced by images based on Fedora 33
- The 'which' package is now installed as a dependency
- Removed a temporary workaround for dynaconf switching from PyYAML to ruamel.yaml

UI
--

- Added missing information about the play when browsing details for a task result

Upgrade notes
-------------

The new controller hostname feature introduces a SQL migration to update the database schema.
After upgrading, database migrations will need to be run at least once using 'ara-manage migrate'.

Because the hostname was not previously saved and can't be recovered retroactively,
playbooks that were recorded before the upgrade will have the controller set to 'localhost'.