As per title, all hosts running this role should be on Buster. Ideally by FQ2 FY20-21.
```
root@cumin1001:~# cumin 'P{O:netmon} and not P{F:lsbdistcodename = buster}'
2 hosts will be targeted:
netmon[1002,2001].wikimedia.org
DRY-RUN mode enabled, aborting
```
Current plan:
[x] Lower TTL for librenms/smokeping DNS records https://gerrit.wikimedia.org/r/c/operations/dns/+/615417
[] Reimage netmon2001 with Buster, verify basic puppet runs are working as intended
[] Flip netmon2001 to be the active server
[] Sync RRDs in `/srv/librenms/rrd/`
[] Sync rancid in `/var/lib/rancid/core`
[] Set netmon2001 as `active_server` in puppet, run puppet on both netmon1002 and netmon2001
[] Flip DNS for librenms and smokeping to netmon2001
[] Verify librenms is working as intended: users can login, data is collected, alerts can be sent, etc
[] Reimage netmon1002 with Buster
[] Flip back from netmon2001 to netmon1002
[] Raise TTL again for librenms/smokeping