Suppressing appoptics_return ERROR messages in the logs

Version: Salt Open 3001

When using Salt Open 3001, you may see repeated error messages about the appoptics_return module.

2020-06-18 19:53:57,424 [salt.loaded.int.returner.appoptics_return:100 ][ERROR ][50] The appoptics_return module couldn't load the appoptics_metrics module.
2020-06-18 19:53:57,424 [salt.loaded.int.returner.appoptics_return:102 ][ERROR ][50] please make sure it is installed and is in the PYTHON_PATH.

If you are not using this returner, you can suppress these error messages using the log_granular_levels option:

log_granular_levels:
  'salt.loaded.int.returner.appoptics_return': 'critical'

The salt master should be restarted after adding the configuration, e.g.:

sudo systemctl restart salt-master

A fix has been proposed in https://github.com/saltstack/salt/pull/57723.