Comment 0 for bug 1620789

There is a LOG.trace method and a TRACE level:

https://github.com/openstack/oslo.log/blob/d56c3e941c6c7f5861311cae54625551053f2e26/oslo_log/handlers.py#L33

But not way to configure it's usage, like we have for CONF.debug and CONF.verbose.

I think the only way you can get TRACE logging today is via CONF.default_log_levels, but that's not very useful in a service like nova.

We'd have to update oslo_log.log._refresh_root_level also to check CONF.trace:

https://github.com/openstack/oslo.log/blob/d56c3e941c6c7f5861311cae54625551053f2e26/oslo_log/log.py#L330

For something like this:

    if CONF.trace:
        log_root.setLevel(TRACE)

For context, we want to drop some nova-scheduler logs from DEBUG to TRACE here:

https://review.openstack.org/#/c/366283/

But there isn't a way to turn those on.