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: api_op_GetJourneyRunExecutionActivityMetrics.go
    path of file: ./repos/aws-sdk-go-v2/service/pinpoint
    
    the code of the file until where you have to start completion: // Code generated by smithy-go-codegen DO NOT EDIT.

package pinpoint

import (
	"context"
	"fmt"
	awsmiddleware "github.com/aws/aws-sdk-go-v2/aws/middleware"
	"github.com/aws/aws-sdk-go-v2/service/pinpoint/types"
	"github.com/aws/smithy-go/middleware"
	smithyhttp "github.com/aws/smithy-go/transport/http"
)

// Retrieves (queries) pre-aggregated data for a standard run execution metric
// that applies to a journey activity.
func (c *Client) GetJourneyRunExecutionActivityMetrics(ctx context.Context, params *GetJourneyRunExecutionActivityMetricsInput, optFns ...func(*Options)) (*GetJourneyRunExecutionActivityMetricsOutput, error) {
	if params == nil {
		params = &GetJourneyRunExecutionActivityMetricsInput{}
	}

	result, metadata, err := c.invokeOperation(ctx, "GetJourneyRunExecutionActivityMetrics", params, optFns, c.addOperationGetJourneyRunExecutionActivityMetricsMiddlewares)
	if err != nil {
		return nil, err
	}

	out := result.(*GetJourneyRunExecutionActivityMetricsOutput)
	out.ResultMetadata = metadata
	return out, nil
}

type GetJourneyRunExecutionActivityMetricsInput struct {

	// The unique identifier for the application. This identifier is displayed as the
	// Project ID on the Amazon Pinpoint
    
func (c *Client) addOperationGetJourneyRunExecutionActivityMetricsMiddlewares(stack *middleware.Stack, options Options) (err error) {
	if err := stack.Serialize.Add(&setOperationInputMiddleware{}, middleware.After); err != nil {
		return err
	}
	err = stack.Serialize.Add(&awsRestjson1_serializeOpGetJourneyRunExecutionActivityMetrics{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsRestjson1_deserializeOpGetJourneyRunExecutionActivityMetrics{}, middleware.After)
	if err != nil {
		return err
	}
	if err := addProtocolFinalizerMiddlewares(stack, options, "GetJourneyRunExecutionActivityMetrics"); err != nil {
		return fmt.Errorf("add protocol finalizers: %v", err)
	}

	if err = addlegacyEndpointContextSetter(stack, options); err != nil {
		return err
	}
	if err = addSetLoggerMiddleware(stack, options); err != nil {
		return err
	}
	if err = addClientRequestID(stack); err != nil {
		return err
	}
	if err = addComputeContentLength(stack); err != nil {
		return err
	}
	if err = addResolveEndpointMiddleware(stack, options); err != nil {
		return err
	}
	if err = addComputePayloadSHA256(stack); err != nil {
		return err
	}
	if err = addRetry(stack, options); err != nil {
		return err
	}
	if err = addRawResponseToMetadata(stack); err != nil {
		return err
	}
	if err = addRecordResponseTiming(stack); err != nil {
		return err
	}
	if err = addClientUserAgent(stack, options); err != nil {
		return err
	}
	if err = smithyhttp.AddErrorCloseResponseBodyMiddleware(stack); err != nil {
		return err
	}
	if err = smithyhttp.AddCloseResponseBodyMiddleware(stack); err != nil {
		return err
	}
	if err = addSetLegacyContextSigningOptionsMiddleware(stack); err != nil {
		return err
	}
	if err = addOpGetJourneyRunExecutionActivityMetricsValidationMiddleware(stack); err != nil {
		return err
	}
	if err = stack.Initialize.Add(newServiceMetadataMiddleware_opGetJourneyRunExecutionActivityMetrics(options.Region), middleware.Before); err != nil {
		return err
	}
	if err = addRecursionDetection(stack); err != nil {
		return err
	}
	if err = addRequestIDRetrieverMiddleware(stack); err != nil {
		return err
	}
	if err = addResponseErrorMiddleware(stack); err != nil {
		return err
	}
	if err = addRequestResponseLogging(stack, options); err != nil {
		return err
	}
	if err = addDisableHTTPSMiddleware(stack, options); err != nil {
		return err
	}
	return nil
}