maas-dns floods syslog by reloading all zones every 2 seconds

[Jeff Lane ]

bind is reloading every zone every 2 - 3 seconds with a new serial number. It basically updates every zone, reloads, then updates every zone and reloads again.

These lines are from syslog over 5 minutes showing the reload message for just one zone:

http://pastebin.ubuntu.com/25516608/

Note there are 89 zone reloads in just 5 minutes.

Here is a single reload worth of messages:

https://pastebin.canonical.com/198066/

that's 260 new lines of text flooding syslog every 2 seconds.

maas-dns needs to create a separate logging facility to log named and maas-dns messages outside of syslog.

This is causing syslog to grow upwards of 700 MB per day

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: maas-dns 2.2.1-6078-g2a6d96e-0ubuntu1~16.04.1
ProcVersionSignature: Ubuntu 4.4.0-87.110-generic 4.4.73
Uname: Linux 4.4.0-87-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
Date: Mon Sep 11 16:14:58 2017
JournalErrors:
 Error: command ['journalctl', '-b', '--priority=warning', '--lines=1000'] failed with exit code 1: Hint: You are currently not seeing messages from other users and the system.
       Users in the 'systemd-journal' group can see all messages. Pass -q to
       turn off this notice.
 No journal files were opened due to insufficient permissions.
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: maas
UpgradeStatus: No upgrade log present (probably fresh install)