Juju 2.8 creates admission webhook without dry run support

[Kenneth Koski]

I've got a charm that spins up Istio, which does some validation of existing infrastructure while booting up. The admission webhook that Juju creates causes istio-pilot to not finish setting up properly, and logs these lines repeatedly:

2020-03-31T20:32:41.483291Z info validationController Reconcile(enter): retry dry-run creation of invalid config
2020-03-31T20:32:41.484509Z info validationController Not ready to switch validation to fail-closed: dummy invalid rejected for the wrong reason: admission webhook "admission.juju.is" does not support dry run

It looks like if Juju's admission webhook supported dry runs, this issue would go away.

[Yang Kelvin Liu (kelvin.liu)]

Hi Kenneth,
I deployed https://github.com/juju-solutions/bundle-istio but wasn't able to reproduce this issue.
Would you give some reproduce steps?

Thanks

[Ian Booth (wallyworld)]

Marking as Incomplete but we can adjust once we are able to figure out how to reproduce.

[Harry Pidcock (hpidcock)]

https://github.com/juju/juju/pull/11537