This commit renames "Message templates" to "Notification templates"
in the user interface as it suggests that these templates cannot
be used to template anything other than the message. However, message
templates are much more general and can be used to template other fields
too such as the subject of an email, or the title of a Slack message.
without setting function map from alertmanager we receive error:
method=PUT path=/api/v1/provisioning/templates/slack.message status=400
level=error msg="invalid object specification: invalid template: template: :1: function \"toUpper\" not defined"
So for validation we should use the same settings as alertmanager do
for templates internally.
* Alerting: validate that the receiver exist when updating routing tree
* rename interface
* add missing file
* change constructor
* fix e2e tests
* only import package once
* add unit test for bug
* wording
* close response body
* Update pkg/services/ngalert/api/tooling/definitions/alertmanager_validation.go
* refactor to remove database roundtrip
* Add validator for mute timing and make it provisionable
* Add tests to ensure prometheus validators are running and errors are propagated
* Internal API for manipulating mute timings
* Define and generate API layer
* Wire up generated code
* Implement API handlers
* Tests for golang layer
* Fix reference bug
* Fix linter and auth tests
* Resolve semantic errors and regenerate
* Remove pointless comment
* Extract out provisioning path param keys, simplify
* Expected number of paths
