- Added `kubelet_container_log_size_bytes` metric representing the log file size of a container. ([#70749](https://github.com/kubernetes/kubernetes/pull/70749), [@brancz](https://github.com/brancz))

  
  When adding links which point to resources within git repositories, like
  KEPs or supporting documentation, please reference a specific commit and avoid
  linking directly to the master branch. This ensures that links reference a
  specific point in time, rather than a document that may change over time.
  

* Support metrics API in `kubectl top` commands. ([#56206](https://github.com/kubernetes/kubernetes/pull/56206), [@brancz](https://github.com/brancz))

* Bump GCE metadata proxy to v0.1.9 to pick up security fixes. ([#58221](https://github.com/kubernetes/kubernetes/pull/58221), [@ihmccreery](https://github.com/ihmccreery))

<p>
"If" statements specify the conditional execution of two branches
according to the value of a boolean expression.  If the expression
evaluates to true, the "if" branch is executed, otherwise, if
present, the "else" branch is executed.
</p>

<pre class="ebnf">
IfStmt = "if" [ SimpleStmt ";" ] Expression Block [ "else" ( IfStmt | Block ) ] .
</pre>

<pre>
if x &gt; max {
	x = max

### Other notable changes

* Backport of the IPAM allocator enhancements to 1.8 branch. ([#62041](https://github.com/kubernetes/kubernetes/pull/62041), [@satyasm](https://github.com/satyasm))

- Added `--concurrency` flag to configure the concurrency of `kubectl diff` execution, defaults to 1. ([#118810](https://github.com/kubernetes/kubernetes/pull/118810), [@brancz](https://github.com/brancz))
- Added `ConsistentListFromCache` feature gate that allows apiserver to serve consistent lists from cache. ([#118508](https://github.com/kubernetes/kubernetes/pull/118508), [@serathius](https://github.com/serathius))

* apiserver: fixes handling and logging of panics in REST handlers to prevent crashes ([#71076](https://github.com/kubernetes/kubernetes/pull/71076), [@liggitt](https://github.com/liggitt))
* Upgrade golang.org/x/net image to release-branch.go1.10 ([#70663](https://github.com/kubernetes/kubernetes/pull/70663), [@wenjiaswe](https://github.com/wenjiaswe))

  
  When adding links which point to resources within git repositories, like
  KEPs or supporting documentation, please reference a specific commit and avoid
  linking directly to the master branch. This ensures that links reference a
  specific point in time, rather than a document that may change over time.
  

  
  When adding links which point to resources within git repositories, like
  KEPs or supporting documentation, please reference a specific commit and avoid
  linking directly to the master branch. This ensures that links reference a
  specific point in time, rather than a document that may change over time.
  

* Upgrade golang.org/x/net image to release-branch.go1.10 ([#70663](https://github.com/kubernetes/kubernetes/pull/70663), [@wenjiaswe](https://github.com/wenjiaswe))