Remove default debug settings from ceph charms

[Ponnuvel Palaniyappan]

ceph-{charms} set various default debug-{subsystem} values.

This is all setting the same default value as what they'd have been otherwise set by Ceph.

But this makes changing them via Ceph config database impossible
as the local /etc/ceph.conf takes priority and ignored config db values.

I don't see any advantage to setting these defaults in the charms.
While we can still keep the option configurable in the charms,
I think we should just get rid of the setting any default values.

[Peter Sabaini (peter-sabaini)]

@Ponnuvel,
we're setting the debug mon and debug osd settings in ceph.conf, these should be configurable via the loglevel option though.

From the ceph.conf template:

debug mon = {{ loglevel }}/5
debug osd = {{ loglevel }}/5

Does this not work for you?

[Peter Sabaini (peter-sabaini)]

Or is the ask not to set anything in ceph.conf *unless* an explicit value has been configured via loglevel?

[Ponnuvel Palaniyappan (pponnuvel)]

@Peter

> Or is the ask not to set anything in ceph.conf *unless* an explicit value has been configured via loglevel?

Yes.

To be clear, this isn't a bug. I am not suggesting that we remove the loglevel from the charms - just suggesting that *not* setting any defaults makes it better if one wants to use Ceph's config database (which is better for managing configuration changes and is what upstream recommends rather the ceph.conf).

Somewhat related: https://bugs.launchpad.net/charm-ceph-mon/+bug/1891096

i.e. simply leave the "defaults:" empty (like we do for several other options) and if someone does set via juju, so be it.

[Peter Sabaini (peter-sabaini)]

This seems reasonable, thanks Pon