Add stdout sink / support promtail

[varac]

We're using promtail to aggregate logs so a sinple stdout sink would be perfect for promtail to gather the
kube-eventer logs - or do they already show up in the pod stdout log ?

[ringtail]

We're using promtail to aggregate logs so a sinple stdout sink would be perfect for promtail to gather the
kube-eventer logs - or do they already show up in the pod stdout log ?

I think a seperate log file would be better

[varac]

from https://12factor.net/logs:

A twelve-factor app never concerns itself with routing or storage of its output stream. It should not attempt to write to or manage logfiles. Instead, each running process writes its event stream, unbuffered, to stdout

[varac]

@ringtail Why do you think a logfile is better ? Promtail could handle both log files and stdout, so I don't care too much at the end.

[ringtail]

@ringtail Why do you think a logfile is better ? Promtail could handle both log files and stdout, so I don't care too much at the end.

I agree with you. Would you like to open a pr?