Docs: Update what's new in 6.6 (#21699)

* Update what's new in 6.6

* Add upgrading and changelog sections

* Remove lines

* Update cookie management section

* Update Bar Gauge unfilled option

* Add missing dot

docs/sources/guides/whats-new-in-v6-6.md

@@ -39,16 +39,11 @@ Grafana 6.6 comes with a lot of new features and enhancements:
 - [**CloudWatch:** Calculate period based on time range]({{< relref "#cloudwatch-calculate-period-based-on-time-range" >}})
 - [**CloudWatch:** Display partial result in graph when max DP/call limit is reached]({{< relref "#cloudwatch-display-partial-result-in–graph–when–max–data–points–per–call-limit-is-reached" >}})
 
-More details will be added as we're getting closer to the stable release.
-
 ## New stat panel
 
 {{< docs-imagebox img="/img/docs/v66/stat_panel_dark2.png" max-width="1024px" caption="Stat panel" >}}
 
-This release adds a new panel named `Stat`. This panel is designed to replace the current `Singlestat` as the primary way
-to show big single number panels along with a sparkline. This panel is of course building on our new panel
-infrastructure and option design. So you can use the new thresholds UI and data links. It also supports the same
-repeating feature as Gauge & Bar Gauge panels, meaning it will repeat a separate visualization for every series or row
+This release adds a new panel named `Stat`. This panel is designed to replace the current `Singlestat` as the primary way to show big single number panels along with a sparkline. This panel is of course building on our new panel infrastructure and option design. So you can use the new threshold UI and data links. It also supports the same repeating feature as the Gauge and  Bar Gauge panels, meaning it will repeat a separate visualization for every series or row
 in the query result.
 
 Key features:
@@ -57,31 +52,25 @@ Key features:
 - Automatic layout handling based on panel size
 - Colors based on thresholds that adapt to light or dark theme
 - Data links support
-- Repeats horizontally or vertically for every series, row or column
+- Repeats horizontally or vertically for every series, row, or column
 
 Here is how it looks in light theme:
 
 {{< docs-imagebox img="/img/docs/v66/stat_panel_light.png" max-width="1024px" caption="Stat panel" >}}
 
-## Auto min max
+## Auto min-max
 
-For the panels Gauge, Bar Gauge & Stat you can now leave the min and max settings empty. Grafana will, in that case, calculate the min & max based on
-all the data.
+For the panels Gauge, Bar Gauge, and Stat, you can now leave the min and max settings empty. Grafana will, in that case, calculate the min and max based on all the data.
 
 ## News panel
 
-This panel supports showing RSS feeds as news items. It is used in the updated default home dashboard. Add it to
-your custom home dashboards to keep up to date with Grafana news or switch the default RSS feed to one of your choice.
-It currently only supports RSS (not Atom).
+This panel shows RSS feeds as news items in the default home dashboard for v6.6. Add it to your custom home dashboards to keep up-to-date with Grafana news, or switch the default RSS feed to one of your choice.
 
 {{< docs-imagebox img="/img/docs/v66/news_panel.png" max-width="600px" caption="News panel" >}}
 
 ## Custom data units
 
-A top feature request for years is now finally here. All panels now support custom units. Just specify any text in the
-unit picker and select the `Custom: <your unit>` option. By default it will be used as a suffix unit. If you want a
-custom prefix just type `prefix: <your unit>` to make the custom unit appear before the value. If you want a custom
-SI unit (with auto SI suffixes) specify `si:Ups`. A value like 1000 will be rendered as `1 kUps`.
+A top feature request for years is now finally here. All panels now support custom units. Type any text in the unit picker and select the `Custom: <your unit>` option. By default, the text will be used as a suffix unit. If you want a custom prefix, then type `prefix: <your unit> ` to make the custom unit appear before the value. If you want a custom SI unit (with auto SI suffixes) specify `si:Ups`. A value like 1000 will be rendered as `1 kUps`.
 
 {{< docs-imagebox img="/img/docs/v66/custom_unit_burger1.png" max-width="600px" caption="Custom unit" >}}
 
@@ -91,9 +80,7 @@ Paste a native emoji in the unit picker and pick it as a custom unit:
 
 ## Bar Gauge unfilled option
 
-This visualization has gotten a new display option: `Unfilled`. This new option is enabled by default so it will
-change how this visualization is displayed on old dashboards. If you prefer the old behavior where unfilled area
-was not shown and the value is followed directly after you have to update the visualization settings.
+The Bar Gauge visualization has a new display option: `Unfilled`. This new option is enabled by default, so it will change how this visualization is displayed on old dashboards. If you prefer the old behavior where unfilled area was not shown and the value followed directly after, you have to update the visualization settings.
 
 {{< docs-imagebox img="/img/docs/v66/bar_gauge_unfilled.png" max-width="900px" caption="Bar gauge unfilled" >}}
 
@@ -101,16 +88,16 @@ was not shown and the value is followed directly after you have to update the vi
 
 The time picker has gotten a major design update. Key changes:
 
-- Quickly access the absolute from & to input fields without an extra click.
-- Calendar automatically shows when from or to inputs has focus
-- A single calendar view can be used to select and show the from & to date.
-- Select recent absolute ranges
+- Quickly access the absolute from and to input fields without an extra click.
+- Calendar automatically shows when from or to inputs has focus.
+- A single calendar view can be used to select and show the from and to date.
+- You can now select recent absolute ranges.
 
 {{< docs-imagebox img="/img/docs/v66/time_picker_update.png" max-width="700px" caption="New time picker" >}}
 
 ## Alerting enhancements
 
-- We have introduced a new configuration for enforcing a minimal interval between evaluations, to reduce load on the backend.
+- We have introduced a new configuration for enforcing a minimal interval between evaluations to reduce load on the backend.
 - The email notifier can now optionally send a single email to all recipients.
 - OpsGenie, PagerDuty, Threema, and Google Chat notifiers have been updated to send additional information.
 
@@ -118,23 +105,25 @@ The time picker has gotten a major design update. Key changes:
 
 In order to align with a [change in Chrome 80](https://www.chromestatus.com/feature/5088147346030592), a breaking change has been introduced to Grafana's [`cookie_samesite` setting]({{< relref "../installation/configuration.md#cookie-samesite" >}}). Grafana now properly renders cookies with the `SameSite=None` attribute when this setting is `none`. The previous behavior of `none` was to omit the `SameSite` attribute from cookies. Grafana will use the previous behavior when `cookie_samesite` is set to `disabled`.
 
+Read more about this in the [upgrade notes]({{< relref "../installation/upgrading/#important-changes-regarding-samesite-cookie-attribute" >}}).
+
 ## Explore/Logs Panel: Log message line wrapping options
 
-We are introducing wrap-lines option for logs, as for some of our users it's more efficient to see one line per log message.The wrapped-line option is set as a default, unwrapped setting results in horizontal scrolling.
+We introduced wrap-lines option for logs, as for some of our users it's more efficient to see one line per log message.The wrapped-line option is set as a default, unwrapped setting results in horizontal scrolling.
 
-{{< docs-imagebox img="/img/docs/v66/explore_wrap_lines.gif" max-width="800px" caption="Log message line wrapping" >}}
+{{< docs-imagebox img="/img/docs/v66/explore_wrap_lines.gif" max-width="600px" caption="Log message line wrapping" >}}
 
 ## Explore/Logs Panel: Column with unique log labels
 
 After feedback from our community, we have decided to reintroduce a labels column. However, for better readability and usefulness, we have transformed it into Unique labels column and include only non-common labels, as all common labels are displayed above.
 
-{{< docs-imagebox img="/img/docs/v66/explore_labels_column.png" max-width="800px" caption="Unique log labels column" >}}
+{{< docs-imagebox img="/img/docs/v66/explore_labels_column.png" max-width="600px" caption="Unique log labels column" >}}
 
 ## Explore: Context tooltip
 
 Isolating a series from a big set of lines in a graph is important for drill-downs. That's why we have implemented context tooltip in Explore that allows interaction to copy data and labels from it to further refine the query.
 
-{{< docs-imagebox img="/img/docs/v66/explore_context_tooltip.png" max-width="800px" caption="Explore context tooltip" >}}
+{{< docs-imagebox img="/img/docs/v66/explore_context_tooltip.png" max-width="600px" caption="Explore context tooltip" >}}
 
 ## Enterprise: White labeling
 
@@ -165,9 +154,9 @@ footer_links_guides_text = Guides
 footer_links_guides_url = http://your.guides.site
 ```
 
-Customize the login page, side menu bar & footer links.
+Customize the login page, side menu bar, and footer links.
 
-{{< docs-imagebox img="/img/docs/v66/whitelabeling_1.png" max-width="800px" caption="White labeling example" >}}
+{{< docs-imagebox img="/img/docs/v66/whitelabeling_1.png" max-width="700px" caption="White labeling example" >}}
 
 ## Stackdriver: Meta labels
 
@@ -182,3 +171,11 @@ When the period field was left blank in Grafana 6.5, it would default to 60 seco
 ## CloudWatch: Display partial result in graph when max data points per call limit is reached
 
 In case all queries in a GMD call are metric stat (not using math expressions), grafana will paginate the response until all data points are received. But pagination is not supported in case a math expression is being used, so in that case it's not possible to receive more than 100,800 data points. Previously when that limit was reached, we only displayed an error message. In Grafana 6.6, we also display the 100,800 data point that were received in the graph.
+
+## Upgrading
+
+See [upgrade notes]({{< relref "../installation/upgrading/#upgrading-to-v6-6" >}}).
+
+## Changelog
+
+Check out [CHANGELOG.md](https://github.com/grafana/grafana/blob/master/CHANGELOG.md) for a complete list of new features, changes, and bug fixes.