Same warning, regarding deprecation of use-floating-ip, seen 3 times during bootstrap.

[Heather Lanigan]

Warning 1 time in the same command is sufficient.

$ juju bootstrap serverstack test-ipv6
WARNING Config attribute "use-floating-ip" is deprecated.
You can instead use the constraint "allocate-public-ip".
Creating Juju controller "test-ipv6" on serverstack/serverstack
Looking for packaged Juju agent version 2.9-beta1 for amd64
No packaged binary found, preparing local Juju agent binary
WARNING Config attribute "use-floating-ip" is deprecated.
You can instead use the constraint "allocate-public-ip".
Launching controller instance(s) on serverstack/serverstack...
 - cc323e34-9e09-4ad5-869b-83ad860956fd (arch=amd64 mem=4G cores=2), wait 10 seconds before retry, attempt 1
WARNING Config attribute "use-floating-ip" is deprecated.
You can instead use the constraint "allocate-public-ip".
Installing Juju agent on bootstrap instance
Fetching Juju Dashboard 0.2.0
Waiting for address
Attempting to connect to 10.x.x.x:22
Attempting to connect to 10.x.x.x:22
Connected to 10.x.x.x
Running machine configuration script...
Bootstrap agent now started
Contacting Juju controller at 10.x.x.x to verify accessibility...

Bootstrap complete, controller "test-ipv6" is now available
Controller machines are in the "controller" model
Initial model "default" added

[Heather Lanigan (hmlanigan)]

One way to resolve the too many warnings, remove the deprecated config.

[Heather Lanigan (hmlanigan)]

3.0: https://github.com/juju/juju/pull/14231

[Heather Lanigan (hmlanigan)]

2.9 upgrade step to remove unnecessary warnings when value set to false and not used anyways. https://github.com/juju/juju/pull/14242

[Heather Lanigan (hmlanigan)]

This is as resolved as it will be. The warnings will not be removed in total for 2.9.x, but quieted some. The config key has been removed in 3.0