## External Dependencies

Continuous integration builds use Docker versions 1.11.2, 1.12.6, 1.13.1,
and 17.03.2. These versions were validated on Kubernetes 1.8. However,
consult an appropriate installation or upgrade guide before deciding what
versions of Docker to use.

- Docker 1.13.1 and 17.03.2

    - Shared PID namespace, live-restore, and overlay2 were validated.

    - **Known issues**

## Major themes

Kubernetes is developed by community members whose work is organized into
[Special Interest Groups](https://github.com/kubernetes/community/blob/master/sig-list.md), which provide the themes that guide their work. For the 1.9 release, these themes included:

### API Machinery

Extensibility. SIG API Machinery added a new class of admission control webhooks (mutating), and brought the admission control webhooks to beta.

1F9A5..1F9AA  ; valid                  ;      ; NV8    # 12.0 SLOTH..OYSTER
1F9AB..1F9AD  ; valid                  ;      ; NV8    # 13.0 BEAVER..SEAL
1F9AE..1F9AF  ; valid                  ;      ; NV8    # 12.0 GUIDE DOG..PROBING CANE
1F9B0..1F9B9  ; valid                  ;      ; NV8    # 11.0 EMOJI COMPONENT RED HAIR..SUPERVILLAIN
1F9BA..1F9BF  ; valid                  ;      ; NV8    # 12.0 SAFETY VEST..MECHANICAL LEG

rch\"] {\n  outline-offset: -2px; // 1\n  -webkit-appearance: textfield; // 2\n}\n\n// 1. A few input types should stay LTR\n// See https://rtlstyling.com/posts/rtl-styling#form-inputs\n// 2. RTL only output\n// See https://rtlcss.com/learn/usage-guide/control-directives/#raw\n\n/* rtl:raw:\n[type=\"tel\"],\n[type=\"url\"],\n[type=\"email\"],\n[type=\"number\"] {\n  direction: ltr;\n}\n*/\n\n// Remove the inner padding in Chrome and Safari on macOS.\n\n::-webkit-search-decoration {\n  -webkit-appearance:...