code: private String getPartitionLevelJobInstanceWildCard(long rootJobInstanceId, String stepName) {
  
  		StringBuilder sb = new StringBuilder(":");
  		sb.append(Long.toString(rootJobInstanceId));
  		sb.append(":");
  		sb.append(stepName);
  		sb.append(":%");
  
  		return sb.toString();
  	}
docs: Obviously would be nice if the code writing this special format were in the same place as this
  code reading it.
  
  Assumes format like:
  
  JOBINSTANCEDATA
  (jobinstanceid name, ...)
  
  1197,"partitionMetrics","NOTSET"
  1198,":1197:step1:0","NOTSET"
  1199,":1197:step1:1","NOTSET"
  1200,":1197:step2:0","NOTSET"
  
  @param rootJobExecutionId JobExecution id of the top-level job
  @param stepName Step name of the top-level stepName