Update changelog and website for GH-1958

CHANGELOG.md

@@ -51,6 +51,8 @@ IMPROVEMENTS:
    submitted, rather than ignoring it [GH-1782]
  * api: Add method to call `auth/token/create-orphan` endpoint [GH-1834]
  * api: Rekey operation now redirects from standbys to master [GH-1862]
+ * audit/file: Sending a `SIGHUP` to Vault now causes Vault to close and
+   re-open the log file, making it easier to rotate audit logs [GH-1953]
  * auth/aws-ec2: IAM bound parameters on the aws-ec2 backend will perform a
    prefix match instead of exact match [GH-1943]
  * auth/aws-ec2: Added a new constraint `bound_iam_instance_profile_arn` to

website/source/docs/audit/file.html.md

@@ -9,7 +9,17 @@ description: |-
 # Audit Backend: File
 
 The `file` audit backend writes audit logs to a file. This is a very simple audit
-backend: it appends logs to a file. It does not currently assist with any log rotation.
+backend: it appends logs to a file.
+
+## Rotation
+
+The backend does not currently assist with any log rotation. There are very
+stable and feature-filled log rotation tools already, so we recommend using
+existing tools.
+
+As of 0.6.2, sending a `SIGHUP` to the Vault process will cause `file` audit
+backends to close and re-open their underlying file, which can assist with log
+rotation needs.
 
 ## Format