OOM trace files for your Tenant DB are visible on OS, but are missing in Tab Administration -> Diagnosis Files on tenant. Also they are not visible on M_TRACEFILES:
select * from M_TRACEFILES where file_name like '%oom%'
HANA Multitenant DB
tenant system oom , KBA , HAN-STD-ADM-DBA , SAP HANA Studio (Eclipse) Admin Tooling , HAN-DB , SAP HANA Database , Problem
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