***OAuth**: Verify TLS during OAuth callback [#9373](https://github.com/grafana/grafana/issues/9373), thx [@mattbostock](https://github.com/mattbostock)
## Minor
***SMTP**: Make it possible to set specific EHLO for smtp client. [#9319](https://github.com/grafana/grafana/issues/9319)
***Dataproxy**: Allow grafan to renegotiate tls connection [#9250](https://github.com/grafana/grafana/issues/9250)
***SMTP**: Make it possible to set specific HELO for smtp client. [#9319](https://github.com/grafana/grafana/issues/9319)
***Dataproxy**: Allow grafana to renegotiate tls connection [#9250](https://github.com/grafana/grafana/issues/9250)
***HTTP**: set net.Dialer.DualStack to true for all http clients [#9367](https://github.com/grafana/grafana/pull/9367)
***Alerting**: Add diff and percent diff as series reducers [#9386](https://github.com/grafana/grafana/pull/9386), thx [@shanhuhai5739](https://github.com/shanhuhai5739)
***Slack**: Allow images to be uploaded to slack when Token is precent [#7175](https://github.com/grafana/grafana/issues/7175), thx [@xginn8](https://github.com/xginn8)
***Slack**: Allow images to be uploaded to slack when Token is present [#7175](https://github.com/grafana/grafana/issues/7175), thx [@xginn8](https://github.com/xginn8)
***Opsgenie**: Use their latest API instead of old version [#9399](https://github.com/grafana/grafana/pull/9399), thx [@cglrkn](https://github.com/cglrkn)
***Table**: Add support for displaying the timestamp with milliseconds [#9429](https://github.com/grafana/grafana/pull/9429), thx [@s1061123](https://github.com/s1061123)
***Hipchat**: Add metrics, message and image to hipchat notifications [#9110](https://github.com/grafana/grafana/issues/9110), thx [@eloo](https://github.com/eloo)
