always log backtrace with catch-all rescues

lib/logstash/filters/date.rb

@@ -168,6 +168,7 @@ class LogStash::Filters::Date < LogStash::Filters::Base
           @logger.debug "Parsed #{value.inspect} as #{event.timestamp}"
         rescue => e
           @logger.warn "Failed parsing date #{value.inspect} from field #{field}: #{e}"
+          @logger.debug(["Backtrace", e.backtrace])
           # Raising here will bubble all the way up and cause an exit.
           # TODO(sissel): Maybe we shouldn't raise?
           #raise e

lib/logstash/inputs/twitter.rb

@@ -89,6 +89,7 @@ class LogStash::Inputs::Twitter < LogStash::Inputs::Base
             yield status
           rescue => e
             @logger.error e
+            @logger.debug(["Backtrace", e.backtrace])
           end
         end # buffer.extract
       end # response.read_body

lib/logstash/outputs/amqp.rb

@@ -68,6 +68,7 @@ class LogStash::Outputs::Amqp < LogStash::Outputs::Base
         return
       else
         @logger.error("AMQP connection error, will reconnect: #{e}")
+        @logger.debug(["Backtrace", e.backtrace])
         sleep(1)
         retry
       end