Proper logging configuration to disable django error emails

Question

I just got sentry working in my environment and I tried tweaking my logging to make it stop sending error emails, but it still is and I don't understand why. My logging config is:

LOGGING = {
    "version": 1,
    "disable_existing_loggers": False,
    "formatters": {
        "verbose": {
            "format": '%(levelname)s %(asctime)s (%(pathname)s %(funcName)s): "%(message)s"'
        },
        "simple": {"format": "%(levelname)s %(message)s"},
        "django.server": {
            "()": "django.utils.log.ServerFormatter",
            "format": "[%(server_time)s] %(message)s",
        },
    },
    "handlers": {
        "null": {"level": "DEBUG", "class": "logging.NullHandler",},
        "console": {
            "level": "DEBUG",
            "class": "logging.StreamHandler",
            "formatter": "simple",
        },
        "log_file": {
            "level": "DEBUG",
            "class": "logging.handlers.RotatingFileHandler",
            "filename": "/var/log/courtlistener/django.log",
            "maxBytes": "16777216",  # 16 megabytes
            "formatter": "verbose",
        },
        "django.server": {
            "level": "INFO",
            "class": "logging.StreamHandler",
            "formatter": "django.server",
        },
    },
    "loggers": {
        # Disable SuspiciousOperation.DisallowedHost exception ("Invalid
        # HTTP_HOST" header messages.) This appears to be caused by clients that
        # don't support SNI, and which are browsing to other domains on the
        # server. The most relevant bad client is the googlebot.
        "django.security.DisallowedHost": {
            "handlers": ["null"],
            "propagate": False,
        },
        "django.server": {
            "handlers": ["django.server"],
            "level": "INFO",
            "propagate": False,
        },
        # This is the one that's used practically everywhere in the code.
        "cl": {"handlers": ["log_file"], "level": "INFO", "propagate": True,},
    },
}

Is there a missing piece here? I don't know how that'd possibly send emails. Is there another config variable I should be thinking about?

UPDATE: One thing I've noticed is that I get plaintext error emails now instead of the HTML ones I used to get. This changed when I tweaked the logging config, but I have no idea why and Googling it doesn't seem to reveal anything.

Answer 1

Django setups a default mail_admins handler, which you can't simply replace in the handlers section, so if you want to get rid of it you need to overwrite the handlers in the root logger:

All loggers except django.server propagate logging to their parents, up to the root django logger. The console and mail_admins handlers are attached to the root logger to provide the behavior described above.

LOGGING = {
    'loggers': {
        'django': {
            'handlers': [],
            'level': os.getenv('DJANGO_LOG_LEVEL', 'INFO'),
            'propagate': False,
        },
    },

}

[edit] fixed wrong statement about overwriting the handler class, sadly it doesn't work as expected, seems to be hard-coded in some way (too busy to look it up in the django code base).