Tanvi Penumudy created HDDS-8147:
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             Summary: Introduce latency metrics for S3 Gateway operations
                 Key: HDDS-8147
                 URL: https://issues.apache.org/jira/browse/HDDS-8147
             Project: Apache Ozone
          Issue Type: Improvement
          Components: S3
            Reporter: Tanvi Penumudy
            Assignee: Tanvi Penumudy


We are introducing latency metrics for various S3 operations in Apache Ozone to 
help us monitor and improve the performance of S3Gateway. We have added the 
following metrics to the S3GatewayLatencyMetrics class (to their respective 
endpoints):

ObjectEndpoint
 * initMultipartUploadLatencyNs
 * createMultipartKeyLatencyNs
 * completeMultipartUploadLatencyNs
 * abortMultipartUploadLatencyNs
 * copyObjectLatencyNs
 * listPartsLatencyNs
 * createKeyLatencyNs
 * getKeyLatencyNs
 * headKeyLatencyNs
 * deleteKeyLatencyNs

BucketEndpoint
 * getAclLatencyNs
 * putAclLatencyNs
 * createBucketLatencyNs
 * getBucketLatencyNs
 * headBucketLatencyNs
 * deleteBucketLatencyNs
 * listMultipartUploadsLatencyNs

RootEndpoint
 * listS3BucketsLatencyNs

Each metric measures the latency for a specific S3 operation in nanoseconds. 
These metrics shall be used to identify performance bottlenecks and improve 
efficiency.



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