fixup! CLDSRV-750: add analytics fields to server access logs

Author: leif-scality

lib/utilities/serverAccesssLogger.js

@@ -280,6 +280,8 @@ function logServerAccess(params, req, res) {
         bytesReceived: req.parsedContentLength || 0,
         bodyLength: parseInt(req.headers['content-length'], 10) || 0,
         contentLength: req.parsedContentLength || 0,
+        // eslint-disable-next-line camelcase
+        elapsed_ms: params.startTime && params.endTime ? (params.endTime - params.startTime) / 1_000_000 : null,
 
         // AWS access server logs fields https://docs.aws.amazon.com/AmazonS3/latest/userguide/LogFormat.html
         startTime: params.startTime ? params.startTime.toString() : null, // AWS "Time" field