* update interval to fix no unit
* fix bug
* update with new method
* format go
* add test
* change test method to add test error nil
* add simplejson and model package
* change json format
* add parentheses
* add simplejson to function
* change mode to model
* move assert import package
* add one enter to avoid goimport error
* change to test case
* wip: start on refactoring settings
* settings: progress on settings refactor
* refactor: progress on settings refactoring
* fix: fixed failing test
* settings: moved smtp settings from global to instance
Alerting for prometheus have been depending on the step parameter from each query.
In https://github.com/grafana/grafana/pull/9226 we changed the behavior for step in the
frontend which caused problems for alerting. This commit fixes that by introducing a default
min interval value so alerting always have something to depend on.
closes#9777
