Feature request: Being able to use logical OR in filters

[tklausmann]

As per the title: it would be nice to be able to filter alerts bu ORed fields. While this is possible on the Regex level (e.g. instance=~(foo|bar).*, this does not work when the criteria span fields, like instance=foo || alertname=bar (that notation is just an example, I have no strong feelings on what the actual syntax would look like).

[tentakle]

Also, I cannot create a filter instance=~"foo|bar" for an exact search of "foo" and "bar"; the search is performed as .*foo.*|.*bar.*. In Alertmanager this regex works.