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...

{
  ...
  "buildName": "${BUILD_NUMBER}",
  ...
}

you'll hav have to initiate the build via a command similar to 

mvn clean install -Psealights -DBUILD_NUMBER=3

In case you would like to use a timestamp to identify the build reported to Sealights, please prefer to use -DBUILD_NUMBER=`date +"%y%m%d_%H%M"`

Using a timestamp variable in pom.xml

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