Exception thrown in a handler prevents other handlers to be called

@lussoluca, ping, kind reminder about this issue

Sorry for the late response...

I'm checking the WhatFailureGroupHandler, but it seems to me that it ignores the bubbling of each handlers added to it, or I'm wrong?

If some of the handlers added to the group stops the bubbling, all other handlers are executed anyway. This may be OK, but it's a change in the actual behaviour. Maybe we can made this configurable? Allow a developer to choose if a set of handlers must be wrapped by a WhatFailureGroupHandler

Something like:

  monolog.channel_handlers:
    default:
      handlers:
        - name: 'handler_that_may_fail'
          formatter: 'json'
        - name: 'fallback_handler'
          formatter: 'json'
        - name: 'handler_that_will_always_work'
          formatter: 'json'
  monolog.fallback_group:
    - handler_that_may_fail
    - fallback_handler

or:

  monolog.channel_handlers:
    default:
      handlers:
        - name: 'handler_that_may_fail'
          formatter: 'json'
          group: 'group_1'
        - name: 'fallback_handler'
          formatter: 'json'
          group: 'group_1'
        - name: 'handler_that_will_always_work'
          formatter: 'json'
 

If "group" is missing, we add the handler to a default group.