Draft: Merge v3 into master

Assessing adding the latest v3 changes into master.

CHANGELOG

@@ -4,6 +4,11 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [3.1.3] - 2021-07-16
+### Changed
+ - Added interface for authentication proxy Cloud Function egress settings. Required
+   for uptime check configuration of internal services.
+
 ## [3.1.2] - 2021-07-15
 ### Changed
  - Surface Cloud NAT variable for minimum number of SNAT tuples, supporting a larger