AlertingSilencesCreate URL to link to silence form

Create a URL to link to a silence form

When linking to a silence form, provide the default matching labels and comment via matcher and comment query parameters. The matcher parameter should be in the following format [label][operator][value] where the operator parameter can be one of the following: = (equals, not regex), != (not equals, not regex), =~ (equals, regex), !~ (not equals, regex). The URL can contain many query parameters with the key matcher. For example, to link to silence form with matching labels severity=critical & cluster!~europe-.* and comment Silence critical EU alerts, create a URL https://mygrafana/alerting/silence/new?matcher=severity%3Dcritical&matcher=cluster!~europe-*&comment=Silence%20critical%20EU%20alert.

To link to a new silence page for an external Alertmanager, add a alertmanager query parameter with the Alertmanager data source name.