Allow duplicate entries in Bind9 provider - dont alway's assume an update.

[lazypower]

[mirw]

I'm using the DNS charm's programmable-multiple interface as part of the Clearwater Juju Charms (at https://github.com/Metaswitch/clearwater-juju/tree/dnsaas).

I'm hitting this issue because we add multiple A records for the same domain name to represent multiple servers in the same cluster. Unfortunately, each new A record overwrites the previous one, rather than adding to the list, so all load is sent to the last node that came up.

[lazypower]

I'll try to get some time allocated this week to get this update in place @mirw

Sorry you hit this - it was known behavior on initial publish. 🚒 time to fight fires it seems

[mirw]

@chuckbutler, thanks for the update!

Tiers containing single hosts work fine - it's just when we scale up... but juju add-unit makes it very easy to do this, and it makes an impressive demo!