- Deprecate legacy alertmanager. Are the new alert improvements compatible with legacy? I don't think they are. More importantly, I don't think they should be. It will be a pain to manage it at both places.
- Improve msteamsv2 experience. I have taken alertmanager's upstream and merged it with our custom implementation. Note the use of `titleLink` field to propagate the url of the alert.
- Delete the private http server needed for alertmanager. It's cleanup as part of 1.
