Add custom header with grafana user when using proxy

Support list and revoke of user auth tokens in HTTP API

Distributed cache

improve the new PreservePanelOptionsHandler

Add more info to victorOps alert notifications

docs: Change type of 'tags' in annotationQuery result example to list

Added cloudwatch metric math docs

A datasource plugin must return a list of tags in the 'tags' field of
the annotationQuery result. A string 'test' would otherwise result in
4 tags in Grafana: 't','e','s','t'.

explore/logs: Hide empty duplicates column

Fix for firefox checkboxes not appearing properly

used regex instead of string replacing

VisRepeater should not care about the value type