chore: release 15.0.0

[release-please]

🤖 I have created a release *beep* *boop*

15.0.0 (2021-06-08)

⚠ BREAKING CHANGES

• Updated ASM terraform module for 1.8 and 1.9 (Updated ASM terraform module for 1.8 and 1.9 #895)
• K8s provider upgrade (feat!: K8s provider upgrade #892)
• Add multi-repo support for Config Sync (Add multi-repo support for Config Sync #872)
• Add support for enable_l4_ilb_subsetting flag (feat!: Add support for enable_l4_ilb_subsetting flag #896)

Features

• Add multi-repo support for Config Sync (#872) (23da103)
• Add support for enable_l4_ilb_subsetting flag (#896) (7531f90)
• Add use local_ssd_ephemeral_count attribute in node_pool config on beta clusters (#902) (9335262)
• K8s provider upgrade (#892) (9172b3e)
• Updated ASM terraform module for 1.8 and 1.9 (#895) (e2ba8d2)

Bug Fixes

• Add ability to impersonate service accounts in kubectl for all submodules (#903) (fc43485)
• asm destroy (#922) (f3ddbf5)
• Asm overlay path (#921) (5d3dc52)
• docs: Describe ADVANCED_DATAPATH in more detail (#907) (c32c5d1)
• Ensure the ASM module's destroy command removes all ASM components (#918) (00c2b71)
• switch ASM API and IAM flags to use native resources (#914) (ff71123)

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[comment-bot-dev]

Thanks for the PR! 🚀
✅ Lint checks have passed.

[Jberlinsky]

@bharathkkb I have a commit in here, so I'm not comfortable self-LGTMing :)

IHAC who is going to need this (ILB subsetting support) in the imminent future -- any ETA to get this released?

[morgante]

@Jberlinsky Can they reference the release branch for now? In general we avoid rushing releases.

[Jberlinsky]

Absolutely -- just looking for a broad-strokes idea of days/weeks/months to manage expectations :)

[bharathkkb]

@Jberlinsky we usually aim for 2 weeks, we will need an upgrade guide due to some breaking changes.

[morgante]

@bharathkkb Do we need an upgrade guide here? It seems the main breaking change is for ASM and I'm not sure if we actually support upgrade there.

[bharathkkb]

@morgante yeah we do not support upgrades for ASM currently, although I do want to resolve #905 to prevent another breaking change. Provider bumps should be no-op but we have historically documented these.

[morgante]

Provider bumps should be no-op but we have historically documented these.

Yes we should make sure to include that in the release notes (you can simply edit the markdown on this PR).

[release-please]

🤖 Release is at https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/releases/tag/v15.0.0 🌻