Exception handling in plugins

[purbon]

Hi,
from the work I've been doing this days on adding test to plugins without I had the chance to revisit some of them, noticing an interesting pattern on them. Some plugins, use this pattern when handling exceptions:

   begin
     ....
   rescue Exception > e
      @logger.debug("...")
   end

even if this might makes sense for a first implementation of the plugin, so the plugin is not exploding when exceptions are thrown, I think we should improve the way we handle exceptions so we could do a fine granularity control. In some of the plugins there where situation when this exceptions hid errors that would be nice otherwise to notice.

Relates to #2477

[purbon]

@guyboertje your feedback is welcome

[colinsurprenant]

This is a very important issue and lots of thinking and design has been already invested in this and we already have many issues opened around this and in particular #2386 and #2477 (as noted). Do we need to open a new meta issue for this? @jsvd?

This has to tie in with the new ongoing pipeline design and the shutdown work.

[purbon]

Closing this then as duplicate.