<p>
Identifiers name program entities such as variables and types.
An identifier is a sequence of one or more letters and digits.
The first character in an identifier must be a letter.
</p>
<pre class="ebnf">
identifier = letter { letter | unicode_digit } .
</pre>
<pre>
a
_x9
ThisVariableIsExported
αβ
</pre>

<p>
Some identifiers are <a href="#Predeclared_identifiers">predeclared</a>.
</p>

    - [Action Required](#action-required)
    - [Other notable changes](#other-notable-changes)
- [v1.9.10](#v1910)
  - [Downloads for v1.9.10](#downloads-for-v1910)
    - [Client Binaries](#client-binaries-1)
    - [Server Binaries](#server-binaries-1)
    - [Node Binaries](#node-binaries-1)
  - [Changelog since v1.9.9](#changelog-since-v199)
    - [Other notable changes](#other-notable-changes-1)
- [v1.9.9](#v199)

- Fixes a 1.30.0 regression in openapi descriptions of imagePullSecrets and hostAliases fields to mark the fields used as keys in those lists as either defaulted or required. ([#124694](https://github.com/kubernetes/kubernetes/pull/124694), [@pma...

  - [Changelog since v1.12.9](#changelog-since-v1129)
    - [Other notable changes](#other-notable-changes)
- [v1.12.9](#v1129)
  - [Downloads for v1.12.9](#downloads-for-v1129)
    - [Client Binaries](#client-binaries-1)
    - [Server Binaries](#server-binaries-1)
    - [Node Binaries](#node-binaries-1)
  - [Changelog since v1.12.8](#changelog-since-v1128)
    - [Other notable changes](#other-notable-changes-1)
- [v1.12.8](#v1128)

  - `priority_level_seat_count_watermarks` is removed.
  - `priority_level_request_count_samples` is replaced with `priority_level_request_utilization`, which samples every nanosecond rather than every millisecond; the old metric conveyed utilization despite its name.

- Removed legacy cloud provider integration code and the "service-lb-controller", "cloud-node-lifecycle-controller" and the "node-route-controller" from kube-controller-manager. You can now either set the `--cloud-provider` command line argument to "external", or to the empty string. All other values are invalid. ([#128197](https://github.com/kubernetes/kubernetes/pull/128197), [@aojea](https://github.com/aojea)) [SIG API Machinery, Apps and Cloud Provider]

  using Endpoints.
  
  If you were using the aggregated API server feature, and you were writing out
  the endpoints for it by hand (rather than letting kube-controller-manager
  generate `Endpoints` and `EndpointSlices` for it automatically based on the
  Service definition), then you should write out an EndpointSlice object rather

    - [Action Required](#action-required)
    - [Other notable changes](#other-notable-changes)
- [v1.8.14](#v1814)
  - [Downloads for v1.8.14](#downloads-for-v1814)
    - [Client Binaries](#client-binaries-1)
    - [Server Binaries](#server-binaries-1)
    - [Node Binaries](#node-binaries-1)
  - [Changelog since v1.8.13](#changelog-since-v1813)
    - [Other notable changes](#other-notable-changes-1)
- [v1.8.13](#v1813)

  - [Changelog since v1.15.7](#changelog-since-v1157)
    - [Other notable changes](#other-notable-changes)
- [v1.15.7](#v1157)
  - [Downloads for v1.15.7](#downloads-for-v1157)
    - [Client Binaries](#client-binaries-5)
    - [Server Binaries](#server-binaries-5)
    - [Node Binaries](#node-binaries-5)
  - [Changelog since v1.15.6](#changelog-since-v1156)
    - [Other notable changes](#other-notable-changes-1)
- [v1.15.6](#v1156)

    - [Other notable changes](#other-notable-changes)
- [v1.16.4](#v1164)
  - [Downloads for v1.16.4](#downloads-for-v1164)
    - [Client Binaries](#client-binaries-12)
    - [Server Binaries](#server-binaries-12)
    - [Node Binaries](#node-binaries-12)
  - [Changelog since v1.16.3](#changelog-since-v1163)
    - [Other notable changes](#other-notable-changes-1)
- [v1.16.3](#v1163)