Mutable Logging

Registered by Alexis Lee on 2016-03-16

There is a strong desire from operators to be able to reconfigure logging
without a service restart. For example, to selectively enable DEBUG logging in
response to observed issues. Mutable config patches have enabled options to be
mutated at runtime, now we need to do the same for logging config.

Blueprint information

Status:
Not started
Approver:
None
Priority:
Undefined
Drafter:
Alexis Lee
Direction:
Needs approval
Assignee:
Alexis Lee
Definition:
New
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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Gerrit topic: https://review.openstack.org/#q,topic:bp/mutable-logging,n,z

MERGED Addressed by: https://review.openstack.org/254821
    Allow reload of 'debug' option

Addressed by: https://review.openstack.org/293561
    Reload log_config_append config on SIGHUP

Addressed by: https://review.openstack.org/335413
    log: Introduce _iter_loggers

(?)

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