# Using the PutLogEvents API to send manually-created embedded metric format logs
<a name="CloudWatch_Embedded_Metric_Format_Generation_PutLogEvents"></a>

 You can send embedded metric format logs to CloudWatch Logs using the CloudWatch Logs [PutLogEvents](https://docs.aws.amazon.com/AmazonCloudWatchLogs/latest/APIReference/API_PutLogEvents.html) API. When calling PutLogEvents, you have the option to include the following HTTP header, which tells CloudWatch Logs the metrics should be extracted, but it's not required. 

```
x-amzn-logs-format: json/emf
```

 The following is a full example using the AWS SDK for Java 2.x: 

```
package org.example.basicapp;

import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.cloudwatchlogs.CloudWatchLogsClient;
import software.amazon.awssdk.services.cloudwatchlogs.model.DescribeLogStreamsRequest;
import software.amazon.awssdk.services.cloudwatchlogs.model.DescribeLogStreamsResponse;
import software.amazon.awssdk.services.cloudwatchlogs.model.InputLogEvent;
import software.amazon.awssdk.services.cloudwatchlogs.model.PutLogEventsRequest;

import java.util.Collections;

public class EmbeddedMetricsExample {
        public static void main(String[] args) {

                final String usage = "To run this example, supply a Region code (eg. us-east-1), log group, and stream name as command line arguments"
                                + "Ex: PutLogEvents <region-id> <log-group-name> <stream-name>";

                if (args.length != 3) {
                        System.out.println(usage);
                        System.exit(1);
                }

                String regionId = args[0];
                String logGroupName = args[1];
                String logStreamName = args[2];

                CloudWatchLogsClient logsClient = CloudWatchLogsClient.builder().region(Region.of(regionId)).build();

                // Build a JSON log using the EmbeddedMetricFormat.
                long timestamp = System.currentTimeMillis();
                String message = "{" +
                                "  \"_aws\": {" +
                                "    \"Timestamp\": " + timestamp  + "," +
                                "    \"CloudWatchMetrics\": [" +
                                "      {" +
                                "        \"Namespace\": \"MyApp\"," +
                                "        \"Dimensions\": [[\"Operation\"], [\"Operation\", \"Cell\"]]," +
                                "        \"Metrics\": [{ \"Name\": \"ProcessingLatency\", \"Unit\": \"Milliseconds\", \"StorageResolution\": 60 }]" +
                                "      }" +
                                "    ]" +
                                "  }," +
                                "  \"Operation\": \"Aggregator\"," +
                                "  \"Cell\": \"001\"," +
                                "  \"ProcessingLatency\": 100" +
                                "}";
                InputLogEvent inputLogEvent = InputLogEvent.builder()
                        .message(message)
                        .timestamp(timestamp)
                        .build();

                // Specify the request parameters.
                PutLogEventsRequest putLogEventsRequest = PutLogEventsRequest.builder()
                        .logEvents(Collections.singletonList(inputLogEvent))
                        .logGroupName(logGroupName)
                        .logStreamName(logStreamName)
                        .build();

                logsClient.putLogEvents(putLogEventsRequest);

                System.out.println("Successfully put CloudWatch log event");
        }

}
```

**Note**  
 With the embedded metric format, you can track the processing of your EMF logs by metrics that are published in the `AWS/Logs` namespace of your account. These can be used to track failed metric generation from EMF, as well as whether failures happen due to parsing or validation. For more details see [Monitoring with CloudWatch metrics](https://docs.aws.amazon.com/AmazonCloudWatch/latest/logs/CloudWatch-Logs-Monitoring-CloudWatch-Metrics.html).