Annotations are just string maps, but to render those we need a bit more information (is it a link, should it be visible by default). Store them as more complex structs internally, this also allows us to drop alert.Links since we now have enough information to tell if annotation is a link
Strippling labels should be done after alerts are deduplicated, when user requests some alerts with a filter, not during data collection from Alertmanager. When labels are stripped before dedup then they are merged into one, because labels are needed to calculate uniqueness, which means we will return wrong data
Internal packages are supported by Go 1.5+, any package in /internal/ dir is only importable from the same repo. This will cleanup main dir a bit and provide better namespace for unsee subpackages
