You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: processor_metrics.go
    path of file: ./repos/flyte/flyteadmin/pkg/async/notifications/implementations
    
    the code of the file until where you have to start completion: package implementations

import (
	"github.com/prometheus/client_golang/prometheus"

	"github.com/flyteorg/flyte/flytestdlib/promutils"
)

type processorSystemMetrics struct {
	Scope                 promutils.Scope
	MessageTotal          prometheus.Counter
	MessageDoneError      prometheus.Counter
	MessageDecodingError  prometheus.Counter
	MessageDataError   
    
func newProcessorSystemMetrics(scope promutils.Scope) processorSystemMetrics {
	return processorSystemMetrics{
		Scope:                 scope,
		MessageTotal:          scope.MustNewCounter("message_total", "overall count of messages processed"),
		MessageDecodingError:  scope.MustNewCounter("message_decoding_error", "count of messages with decoding errors"),
		MessageDataError:      scope.MustNewCounter("message_data_error", "count of message data processing errors experience when preparing the message to be notified."),
		MessageDoneError:      scope.MustNewCounter("message_done_error", "count of message errors when marking it as done with underlying processor"),
		MessageProcessorError: scope.MustNewCounter("message_processing_error", "count of errors when interacting with notification processor"),
		MessageSuccess:        scope.MustNewCounter("message_ok", "count of messages successfully processed by underlying notification mechanism"),
		ChannelClosedError:    scope.MustNewCounter("channel_closed_error", "count of channel closing errors"),
		StopError:             scope.MustNewCounter("stop_error", "count of errors in Stop() method"),
	}
}