By default, Django sets up two handlers on this logger, one of them
its AdminEmailHandler. We have our own handler for sending email on
error, and we want to stick to that -- we like the format somewhat
better, and crucially we've given it some rate-limiting through
ZulipLimiter.
Since we cleaned out our logging config in e0a5e6fad, though, we've
been sending error emails through both paths. The config we'd had
before that for `django` was redundant with the config on the root --
but having *a* config there was essential for causing
`logging.config.dictConfig`, when Django passes it our LOGGING dict,
to clear out that logger's previous config. So, give it an empty
config.
Django by default configures two loggers: `django` and
`django.server`. We have our own settings for `django.server`
anyway, so this is the only one we need to add.
The stdlib `logging` and `logging.config` docs aren't 100% clear, and
while the source of `logging` is admirably straightforward the source
of `logging.config` is a little twisty, so it's not easy to become
totally confident that this has the right effect just by reading.
Fortunately we can put some of that source-diving to work in writing
a test for it.
This should make it a little easier to understand our logging config
and make changes to it with confidence.
Many of these items that are now redundant used to be required when we
were setting disable_existing_loggers to True (before 500d81bf2), in
order to exempt those loggers from being cleared out. Now they're not.
One bit of test code needed a tweak to how it got its hands on the
AdminZulipHandler instance; it can do it from the list on the root
logger just as well as on the `django` logger.
mypy will error because of the attribute "request" on the LogRecord
object. Since this field is added in our tests dynamically and is not
on the base object, for now we will ignore the type.
neiljp (Neil Pilgrim)
Greg Price
rht
Aditya Bansal
Lech Kaiel
umkay
Tim Abbott