Release notes for Grafana 7.5.0-beta2

CloudWatch: Add support for EC2 IAM role. #31804, @sunker
CloudWatch: Consume the grafana/aws-sdk. #31807, @sunker
CloudWatch: Restrict auth provider and assume role usage according to Grafana configuration. #31805, @sunker
Cloudwatch: ListMetrics API page limit. #31788, @sunker
Cloudwatch: use shared library for aws auth. #29550, @ryantxu
DataLinks: Bring back single click links for Stat, Gauge and BarGauge panel. #31692, @dprokop
Docker: Support pre-installed plugins from other sources in custom Dockerfiles. #31234, @sgnsys3
Elasticseach: Add support for histogram fields. #29079, @simianhacker
Exemplars: Always query exemplars. #31673, @zoltanbedi
Explore: Support full inspect drawer. #32005, @ivanahuckova
HttpServer: Make read timeout configurable but disabled by default. #31575, @bergquist
SQLStore: Close session in withDbSession. #31775, @aknuds1
Templating: Use dashboard timerange when variables are set to refresh 'On Dashboard Load'. #31721, @Elfo404
Tempo: Convert to backend data source. #31618, @zoltanbedi

Admin: Keeps expired api keys visible in table after delete. #31636, @hugohaggmark
Data proxy: Fix encoded characters in URL path should be proxied as encoded. #30597, @marefr
Explore/Logs: Fix escaping in ANSI logs. #31731, @ivanahuckova
GraphNG: Fix tooltip series color for multi data frame scenario. #32098, @dprokop
GraphNG: Make sure data set and config are in sync when initializing and re-initializing uPlot. #32106, @dprokop
Loki: Fix autocomplete when re-editing Loki label values. #31828, @ivanahuckova
MixedDataSource: Name is updated when data source variables change. #32090, @hugohaggmark
PanelInspect: Interpolates variables in CSV file name. #31936, @hugohaggmark
ReduceTransform: Include series with numeric string names. #31763, @hugohaggmark
Snapshots: Fix usage of sign in link from the snapshot page. #31986, @marefr
TimePicker: Fixes hidden time picker shown in kiosk TV mode. #32062, @torkelo
ValueMappings: Fixes value 0 not being mapped. #31924, @Willena
Variables: Fixes filtering in picker with null items. #31979, @hugohaggmark
Variables: Improves inspection performance and unknown filtering. #31811, @hugohaggmark