* master: (30 commits)
changelog: add notes about closing #11882
renamed variable in tests
added comment, variableChange -> variableValueChange
added a test
added if to check if new variable has been added
Gravatar fallback does not respect 'AppSubUrl'-setting (#12149)
change admin password after first login
changelog: adds note about closing #11958
revert: reverted singlestat panel position change PR #12004
Revert "provisioning: turn relative symlinked path into absolut paths"
provisioning: turn relative symlinked path into absolut paths
changelog: adds note about closing #11670
elasticsearch: sort bucket keys to fix issue wth response parser tests
docs: what's new in v5.2
changelog: add notes about closing #11167
docs: docker secrets support. (#12141)
alerting: show alerts for user with Viewer role
datasource: added option no-direct-access to ds-http-settings diretive, closes#12138
provisioning: adds fallback if evalsymlink/abs fails
tests: uses different paths depending on os
...
* rendering: headless chrome progress
* renderer: minor change
* grpc: version hell
* updated grpc libs
* wip: minor progess
* rendering: new image rendering plugin is starting to work
* feat: now phantomjs works as well and updated alerting to use new rendering service
* refactor: renamed renderer package and service to rendering to make renderer name less confusing (rendering is internal service that handles the renderer plugin now)
* rendering: now render key is passed and render auth is working in plugin mode
* removed unneeded lines from gitignore
* rendering: now plugin mode supports waiting for all panels to complete rendering
* fix: LastSeenAt fix for render calls, was not set which causes a lot of updates to Last Seen at during rendering, this should fix sqlite db locked issues in seen in previous releases
* change: changed render tz url parameter to use proper timezone name as chrome does not handle UTC offset TZ values
* fix: another update to tz param generation
* renderer: added http mode to renderer service, new ini setting [rendering] server_url
* refactor: tracing service refactoring
* refactor: sqlstore to instance service
* refactor: sqlstore & registory priority
* refactor: sqlstore refactor wip
* sqlstore: progress on getting tests to work again
* sqlstore: progress on refactoring and getting tests working
* sqlstore: connection string fix
* fix: not sure why this test is not working and required changing expires
* fix: updated grafana-cli