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
Michał Zielonka
Jean-Philippe Quéméner
Alexander Weaver