Added a code example for emailing on 4xx and 5xx errors without 404's

Author: weaverryan

cookbook/logging/monolog_email.rst

@@ -19,7 +19,12 @@ it is broken down.
  handlers:
  mail:
  type: fingers_crossed
+ # 500 errors are logged at the critical level
  action_level: critical
+ # to also log 400 level errors (but not 404's):
+ # action_level: error
+ # excluded_404:
+ # - ^/
  handler: buffered
  buffered:
  type: buffer
@@ -48,6 +53,12 @@ it is broken down.
  type="fingers_crossed"
  action-level="critical"
  handler="buffered"
+ <!--
+ To also log 400 level errors (but not 404's):
+ action-level="error"
+ And add this child inside this monolog:handler
+ <monolog:excluded-404>^/</monolog:excluded-404>
+ -->
  />
  <monolog:handler
  name="buffered"
@@ -81,6 +92,11 @@ it is broken down.
  'mail' => array(
  'type' => 'fingers_crossed',
  'action_level' => 'critical',
+ // to also log 400 level errors (but not 404's):
+ // 'action_level' => 'error',
+ // 'excluded_404s' => array(
+ // '^/',
+ // ),
  'handler' => 'buffered',
  ),
  'buffered' => array(
@@ -108,7 +124,8 @@ setting means that the output is then passed onto the ``buffered`` handler.
 .. tip::
 
  If you want both 400 level and 500 level errors to trigger an email,
- set the ``action_level`` to ``error`` instead of ``critical``.
+ set the ``action_level`` to ``error`` instead of ``critical``. See the
+ code above for an example.
 
 The ``buffered`` handler simply keeps all the messages for a request and
 then passes them onto the nested handler in one go. If you do not use this