Allow notifiers per container

[razvan-moj]

if multiple uses in a cluster want to receive update notifications, but to different Slack channels, it would be nice to have a way to specify the recipient per deployment/pod rather than - what we do now - run multiple instances of Diun, which seems wasteful.

[crazy-max]

@razvan-moj Yes we could allow notifiers per containers through labels/annotations.

[kireque]

This option would be very useful for me! At the moment I use MQTT but everything is published in the same topic. Would be great if there was a separate topic for each container.

[x3ntrix]

Such an option would be useful to use too. We have a docker server which hosts containers from different teams and each team is responsible to keep their containers up-to-date. For notifications, we use mails. The complete mail configuration can be the same in our case, but it would be great to specify/override the mail recipient via a label for each container, so a team receives only mails for their containers.