Given the following parms:

jobid_name=%j@%u@%h
jobid_var=SLURM_JOB_ID

And a job that does not have SLURM_JOB_ID set, it can product a job stats name along the lines of "@4089401@host1".  This will be printed unquoted by the current job_stats code.  This is incorrect according to the YAML spec: https://yaml.org/spec/1.2.2/#rule-c-reserved