HPCC-12369 Fix stats for graphs by naming the graph consistently

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>
Merge pull request #6516 from ghalliday/issue12369

HPCC-12369 Fix stats for graphs by naming the graph consistently

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>