ReleaseNotes: Updated changelog and release notes for 7.5.5 (#33473)

* ReleaseNotes: Updated changelog and release notes for 7.5.5

* Add release notes to index.md

* Update release-notes-7-5-5.md

* Update CHANGELOG.md
Co-authored-by: Ursula Kallio <73951760+osg-grafana@users.noreply.github.com>
Co-authored-by: Josh Hunt <joshhunt@users.noreply.github.com>
Co-authored-by: Ursula Kallio <73951760+osg-grafana@users.noreply.github.com>

CHANGELOG.md

 
+<!-- 7.5.5 START -->
+
+# 7.5.5 (2021-04-28)
+
+### Features and enhancements
+
+* **Explore:** Load default data source in Explore when the provided source does not exist. [#32992](https://github.com/grafana/grafana/pull/32992), [@ifrost](https://github.com/ifrost)
+* **Instrumentation:** Add success rate metrics for email notifications. [#33359](https://github.com/grafana/grafana/pull/33359), [@bergquist](https://github.com/bergquist)
+
+### Bug fixes
+
+* **Alerting:** Remove field limitation from Slack notifications. [#33113](https://github.com/grafana/grafana/pull/33113), [@dsotirakis](https://github.com/dsotirakis)
+* **Auth:** Do not clear auth token cookie when token lookup fails. [#32999](https://github.com/grafana/grafana/pull/32999), [@marefr](https://github.com/marefr)
+* **Bug:** Add git command to Dockerfile.ubuntu file. [#33247](https://github.com/grafana/grafana/pull/33247), [@dsotirakis](https://github.com/dsotirakis)
+* **Explore:** Adjust time to the selected timezone. [#33315](https://github.com/grafana/grafana/pull/33315), [@ifrost](https://github.com/ifrost)
+* **GraphNG:** Fix exemplars window position. [#33427](https://github.com/grafana/grafana/pull/33427), [@zoltanbedi](https://github.com/zoltanbedi)
+* **Loki:** Pass Skip TLS Verify setting to alert queries. [#33025](https://github.com/grafana/grafana/pull/33025), [@ivanahuckova](https://github.com/ivanahuckova)
+* **Postgres:** Fix time group macro when TimescaleDB is enabled and interval is less than a second. [#33153](https://github.com/grafana/grafana/pull/33153), [@marefr](https://github.com/marefr)
+
+<!-- 7.5.5 END -->
+
 <!-- 7.5.4 START -->
 
 # 7.5.4 (2021-04-14)

docs/sources/release-notes/_index.md

@@ -8,6 +8,7 @@ weight = 10000
 Here you can find detailed release notes that list everything that is included in every release as well as notices
 about deprecations, breaking changes as well as changes that relate to plugin development.
 
+- [Release notes for 7.5.5]({{< relref "release-notes-7-5-5" >}})
 - [Release notes for 7.5.4]({{< relref "release-notes-7-5-4" >}})
 - [Release notes for 7.5.3]({{< relref "release-notes-7-5-3" >}})
 - [Release notes for 7.5.2]({{< relref "release-notes-7-5-2" >}})

docs/sources/release-notes/release-notes-7-5-5.md

++++
+title = "Release notes for Grafana 7.5.5"
+[_build]
+list = false
++++
+
+<!-- Auto generated by update changelog github action -->
+
+# Release notes for Grafana 7.5.5
+
+### Features and enhancements
+
+* **Explore:** Load default data source in Explore when the provided source does not exist. [#32992](https://github.com/grafana/grafana/pull/32992), [@ifrost](https://github.com/ifrost)
+* **Instrumentation:** Add success rate metrics for email notifications. [#33359](https://github.com/grafana/grafana/pull/33359), [@bergquist](https://github.com/bergquist)
+
+### Bug fixes
+
+* **Alerting:** Remove field limitation from Slack notifications. [#33113](https://github.com/grafana/grafana/pull/33113), [@dsotirakis](https://github.com/dsotirakis)
+* **Auth:** Do not clear auth token cookie when token lookup fails. [#32999](https://github.com/grafana/grafana/pull/32999), [@marefr](https://github.com/marefr)
+* **Bug:** Add git command to Dockerfile.ubuntu file. [#33247](https://github.com/grafana/grafana/pull/33247), [@dsotirakis](https://github.com/dsotirakis)
+* **Explore:** Adjust time to the selected timezone. [#33315](https://github.com/grafana/grafana/pull/33315), [@ifrost](https://github.com/ifrost)
+* **GraphNG:** Fix exemplars window position. [#33427](https://github.com/grafana/grafana/pull/33427), [@zoltanbedi](https://github.com/zoltanbedi)
+* **Loki:** Pass Skip TLS Verify setting to alert queries. [#33025](https://github.com/grafana/grafana/pull/33025), [@ivanahuckova](https://github.com/ivanahuckova)
+* **Postgres:** Fix time group macro when TimescaleDB is enabled and interval is less than a second. [#33153](https://github.com/grafana/grafana/pull/33153), [@marefr](https://github.com/marefr)
+