Decouple AD and Alerting on Kibana

[ylwu-amzn]

Currently we couple AD and alerting on Kibana. We provide specific monitor input type to create monitor on top of detector. But at the backend we just use AD result indices and custom expression to create monitor. User needs to redirect to monitor page to create/view/update/delete/ monitor and view alert details.

We can put monitor creation on AD page. Call monitor creation API from AD Kibana to create monitor. So we can remove the special input type "Define using anomaly detector" and remove all logic related to AD. That will make it easier for AD future design, development and testing.

To save effort, we can still redirect to alerting page for view monitor details, view alerts history.