Pushover and email should both support imbedded URL’s. I’m not sure if other notification methods so at this point as well but it would be really sweet to be able to embed IMDB/TVRage link for the episode into the Pushover notification/email and any other notifications methods applicable.
Hydra already embeds this data in the History/Analytics. I would assume the variables are already there to pass this through but I’m not sure. From the Wiki it looks like the variable may be $TVDBID?
It would also be able to push a link back to the information in queue on my local Sonarr website I’m sure that with some thought I could come up with some other options that would leverage this capability more heavily.
There is already one similar post entitled Pushover notification - URL not sending.