[Monolog] Add buffer_size on fingers_crossed handler

symfony/monolog-bundle/3.1/config/packages/prod/monolog.yaml

@@ -4,6 +4,7 @@ monolog:
             type: fingers_crossed
             action_level: error
             handler: nested
+            buffer_size:  50 # How many messages should be saved? Prevent memory leaks
             excluded_404s:
                 # regex: exclude all 404 errors from the logs
                 - ^/

symfony/monolog-bundle/3.3/config/packages/prod/monolog.yaml

@@ -5,6 +5,7 @@ monolog:
             action_level: error
             handler: nested
             excluded_http_codes: [404, 405]
+            buffer_size:  50 # How many messages should be saved? Prevent memory leaks
         nested:
             type: stream
             path: "%kernel.logs_dir%/%kernel.environment%.log"